Bump 0.7.0

* Works with egui

---------

Co-authored-by: Ultradesu <ultradesu@hexor.cy>

Cargo.toml

@@ -1,22 +1,44 @@
 [package]
 name = "khm"
-version = "0.6.2"
+version = "0.7.0"
 edition = "2021"
 authors = ["AB <ab@hexor.cy>"]
+description = "KHM - Known Hosts Manager for SSH key management and synchronization"
+homepage = "https://github.com/house-of-vanity/khm"
+repository = "https://github.com/house-of-vanity/khm"
+license = "WTFPL"
+keywords = ["ssh", "known-hosts", "security", "system-admin", "automation"]
+categories = ["command-line-utilities", "network-programming"]
 
 [dependencies]
 actix-web = "4"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-env_logger = "0.11.3"
 log = "0.4"
 regex = "1.10.5"
 base64 = "0.21"
-tokio = { version = "1", features = ["full"] }
+tokio = { version = "1", features = ["full", "sync"] }
 tokio-postgres = { version = "0.7", features = ["with-chrono-0_4"] }
 tokio-util = { version = "0.7", features = ["codec"] }
 clap = { version = "4", features = ["derive"] }
 chrono = "0.4.38"
 reqwest = { version = "0.12", features = ["json"] }
+trust-dns-resolver = "0.23"
+futures = "0.3"
 hostname = "0.3"
 rust-embed = "8.0"
+tray-icon = { version = "0.19", optional = true }
+notify = { version = "6.1", optional = true }
+notify-debouncer-mini = { version = "0.4", optional = true }
+dirs = "5.0"
+eframe = { version = "0.29", optional = true }
+egui = { version = "0.29", optional = true }
+winit = { version = "0.30", optional = true }
+env_logger = "0.11"
+urlencoding = "2.1"
+
+[features]
+default = ["gui"]
+gui = ["tray-icon", "eframe", "egui", "winit", "notify", "notify-debouncer-mini"]
+server = []
+

src/client.rs

@@ -8,14 +8,14 @@ use std::io::{self, BufRead, Write};
 use std::path::Path;
 
 #[derive(Serialize, Deserialize, Clone, Debug)]
-struct SshKey {
+pub struct SshKey {
     server: String,
     public_key: String,
     #[serde(default)]
     deprecated: bool,
 }
 
-fn read_known_hosts(file_path: &str) -> io::Result<Vec<SshKey>> {
+pub fn read_known_hosts(file_path: &str) -> io::Result<Vec<SshKey>> {
     let path = Path::new(file_path);
     let file = File::open(&path)?;
     let reader = io::BufReader::new(file);

src/db.rs

@@ -467,6 +467,71 @@ impl DbClient {
         Ok(affected)
     }
 
+    pub async fn bulk_deprecate_keys_by_servers(
+        &self,
+        server_names: &[String],
+        flow_name: &str,
+    ) -> Result<u64, tokio_postgres::Error> {
+        if server_names.is_empty() {
+            return Ok(0);
+        }
+
+        // Update keys to deprecated status for multiple servers in one query
+        let result = self
+            .client
+            .execute(
+                "UPDATE public.keys 
+                 SET deprecated = TRUE, updated = NOW() 
+                 WHERE host = ANY($1) 
+                 AND key_id IN (
+                     SELECT key_id FROM public.flows WHERE name = $2
+                 )",
+                &[&server_names, &flow_name],
+            )
+            .await;
+        let affected = Self::handle_db_error(result, "bulk deprecating keys")?;
+
+        info!(
+            "Bulk deprecated {} key(s) for {} servers in flow '{}'",
+            affected, server_names.len(), flow_name
+        );
+
+        Ok(affected)
+    }
+
+    pub async fn bulk_restore_keys_by_servers(
+        &self,
+        server_names: &[String],
+        flow_name: &str,
+    ) -> Result<u64, tokio_postgres::Error> {
+        if server_names.is_empty() {
+            return Ok(0);
+        }
+
+        // Update keys to active status for multiple servers in one query
+        let result = self
+            .client
+            .execute(
+                "UPDATE public.keys 
+                 SET deprecated = FALSE, updated = NOW() 
+                 WHERE host = ANY($1) 
+                 AND deprecated = TRUE
+                 AND key_id IN (
+                     SELECT key_id FROM public.flows WHERE name = $2
+                 )",
+                &[&server_names, &flow_name],
+            )
+            .await;
+        let affected = Self::handle_db_error(result, "bulk restoring keys")?;
+
+        info!(
+            "Bulk restored {} key(s) for {} servers in flow '{}'",
+            affected, server_names.len(), flow_name
+        );
+
+        Ok(affected)
+    }
+
     pub async fn restore_key_by_server(
         &self,
         server_name: &str,
@@ -648,6 +713,36 @@ impl ReconnectingDbClient {
         }
     }
 
+    pub async fn bulk_deprecate_keys_by_servers_reconnecting(
+        &self,
+        server_names: Vec<String>,
+        flow_name: String,
+    ) -> Result<u64, tokio_postgres::Error> {
+        match &self.inner {
+            Some(client) => {
+                client
+                    .bulk_deprecate_keys_by_servers(&server_names, &flow_name)
+                    .await
+            }
+            None => panic!("Database client not initialized"),
+        }
+    }
+
+    pub async fn bulk_restore_keys_by_servers_reconnecting(
+        &self,
+        server_names: Vec<String>,
+        flow_name: String,
+    ) -> Result<u64, tokio_postgres::Error> {
+        match &self.inner {
+            Some(client) => {
+                client
+                    .bulk_restore_keys_by_servers(&server_names, &flow_name)
+                    .await
+            }
+            None => panic!("Database client not initialized"),
+        }
+    }
+
     pub async fn restore_key_by_server_reconnecting(
         &self,
         server_name: String,

src/gui/admin/mod.rs

@@ -0,0 +1,5 @@
+mod state;
+mod ui;
+
+pub use state::*;
+pub use ui::*;

src/gui/admin/state.rs

@@ -0,0 +1,178 @@
+use eframe::egui;
+use log::{error, info};
+use std::collections::HashMap;
+use std::sync::mpsc;
+use crate::gui::api::{SshKey, fetch_keys};
+use crate::gui::common::KhmSettings;
+
+#[derive(Debug, Clone)]
+pub enum AdminOperation {
+    LoadingKeys,
+    DeprecatingKey,
+    RestoringKey, 
+    DeletingKey,
+    BulkDeprecating,
+    BulkRestoring,
+    None,
+}
+
+#[derive(Debug, Clone)]
+pub struct AdminState {
+    pub keys: Vec<SshKey>,
+    pub filtered_keys: Vec<SshKey>,
+    pub search_term: String,
+    pub show_deprecated_only: bool,
+    pub selected_servers: HashMap<String, bool>,
+    pub expanded_servers: HashMap<String, bool>,
+    pub current_operation: AdminOperation,
+    pub last_load_time: Option<std::time::Instant>,
+}
+
+impl Default for AdminState {
+    fn default() -> Self {
+        Self {
+            keys: Vec::new(),
+            filtered_keys: Vec::new(),
+            search_term: String::new(),
+            show_deprecated_only: false,
+            selected_servers: HashMap::new(),
+            expanded_servers: HashMap::new(),
+            current_operation: AdminOperation::None,
+            last_load_time: None,
+        }
+    }
+}
+
+impl AdminState {
+    /// Filter keys based on current search term and deprecated filter
+    pub fn filter_keys(&mut self) {
+        let mut filtered = self.keys.clone();
+        
+        // Apply deprecated filter
+        if self.show_deprecated_only {
+            filtered.retain(|key| key.deprecated);
+        }
+        
+        // Apply search filter
+        if !self.search_term.is_empty() {
+            let search_term = self.search_term.to_lowercase();
+            filtered.retain(|key| {
+                key.server.to_lowercase().contains(&search_term) ||
+                key.public_key.to_lowercase().contains(&search_term)
+            });
+        }
+        
+        self.filtered_keys = filtered;
+    }
+    
+    /// Load keys from server
+    pub fn load_keys(&mut self, settings: &KhmSettings, ctx: &egui::Context) -> Option<mpsc::Receiver<Result<Vec<SshKey>, String>>> {
+        if settings.host.is_empty() || settings.flow.is_empty() {
+            return None;
+        }
+        
+        self.current_operation = AdminOperation::LoadingKeys;
+        
+        let (tx, rx) = mpsc::channel();
+        
+        let host = settings.host.clone();
+        let flow = settings.flow.clone();
+        let basic_auth = settings.basic_auth.clone();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                fetch_keys(host, flow, basic_auth).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+        
+        Some(rx)
+    }
+    
+    /// Handle keys load result
+    pub fn handle_keys_loaded(&mut self, result: Result<Vec<SshKey>, String>) {
+        match result {
+            Ok(keys) => {
+                self.keys = keys;
+                self.last_load_time = Some(std::time::Instant::now());
+                self.filter_keys();
+                self.current_operation = AdminOperation::None;
+                info!("Keys loaded successfully: {} keys", self.keys.len());
+            }
+            Err(error) => {
+                self.current_operation = AdminOperation::None;
+                error!("Failed to load keys: {}", error);
+            }
+        }
+    }
+    
+    /// Get selected servers list
+    pub fn get_selected_servers(&self) -> Vec<String> {
+        self.selected_servers
+            .iter()
+            .filter_map(|(server, &selected)| if selected { Some(server.clone()) } else { None })
+            .collect()
+    }
+    
+    /// Clear selected servers
+    pub fn clear_selection(&mut self) {
+        self.selected_servers.clear();
+    }
+    
+    /// Get statistics
+    pub fn get_statistics(&self) -> AdminStatistics {
+        let total_keys = self.keys.len();
+        let active_keys = self.keys.iter().filter(|k| !k.deprecated).count();
+        let deprecated_keys = total_keys - active_keys;
+        let unique_servers = self.keys.iter().map(|k| &k.server).collect::<std::collections::HashSet<_>>().len();
+        
+        AdminStatistics {
+            total_keys,
+            active_keys,
+            deprecated_keys,
+            unique_servers,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct AdminStatistics {
+    pub total_keys: usize,
+    pub active_keys: usize,
+    pub deprecated_keys: usize,
+    pub unique_servers: usize,
+}
+
+/// Get SSH key type from public key string
+pub fn get_key_type(public_key: &str) -> String {
+    if public_key.starts_with("ssh-rsa") {
+        "RSA".to_string()
+    } else if public_key.starts_with("ssh-ed25519") {
+        "ED25519".to_string()
+    } else if public_key.starts_with("ecdsa-sha2-nistp") {
+        "ECDSA".to_string()
+    } else if public_key.starts_with("ssh-dss") {
+        "DSA".to_string()
+    } else {
+        "Unknown".to_string()
+    }
+}
+
+/// Get preview of SSH key (first 12 characters of key part)
+pub fn get_key_preview(public_key: &str) -> String {
+    let parts: Vec<&str> = public_key.split_whitespace().collect();
+    if parts.len() >= 2 {
+        let key_part = parts[1];
+        if key_part.len() > 12 {
+            format!("{}...", &key_part[..12])
+        } else {
+            key_part.to_string()
+        }
+    } else {
+        format!("{}...", &public_key[..std::cmp::min(12, public_key.len())])
+    }
+}

src/gui/admin/ui.rs

@@ -0,0 +1,451 @@
+use eframe::egui;
+use std::collections::BTreeMap;
+use super::state::{AdminState, get_key_type, get_key_preview};
+use crate::gui::api::SshKey;
+
+/// Render statistics cards
+pub fn render_statistics(ui: &mut egui::Ui, admin_state: &AdminState) {
+    let stats = admin_state.get_statistics();
+    
+    ui.group(|ui| {
+        ui.set_min_width(ui.available_width());
+        ui.vertical(|ui| {
+            ui.label(egui::RichText::new("📊 Statistics").size(16.0).strong());
+            ui.add_space(8.0);
+            
+            ui.horizontal(|ui| {
+                ui.columns(4, |cols| {
+                    // Total keys
+                    cols[0].vertical_centered_justified(|ui| {
+                        ui.label(egui::RichText::new("📊").size(20.0));
+                        ui.label(egui::RichText::new(stats.total_keys.to_string()).size(24.0).strong());
+                        ui.label(egui::RichText::new("Total Keys").size(11.0).color(egui::Color32::GRAY));
+                    });
+                    
+                    // Active keys
+                    cols[1].vertical_centered_justified(|ui| {
+                        ui.label(egui::RichText::new("✅").size(20.0));
+                        ui.label(egui::RichText::new(stats.active_keys.to_string()).size(24.0).strong().color(egui::Color32::LIGHT_GREEN));
+                        ui.label(egui::RichText::new("Active").size(11.0).color(egui::Color32::GRAY));
+                    });
+                    
+                    // Deprecated keys
+                    cols[2].vertical_centered_justified(|ui| {
+                        ui.label(egui::RichText::new("❌").size(20.0));
+                        ui.label(egui::RichText::new(stats.deprecated_keys.to_string()).size(24.0).strong().color(egui::Color32::LIGHT_RED));
+                        ui.label(egui::RichText::new("Deprecated").size(11.0).color(egui::Color32::GRAY));
+                    });
+                    
+                    // Servers
+                    cols[3].vertical_centered_justified(|ui| {
+                        ui.label(egui::RichText::new("💻").size(20.0));
+                        ui.label(egui::RichText::new(stats.unique_servers.to_string()).size(24.0).strong().color(egui::Color32::LIGHT_BLUE));
+                        ui.label(egui::RichText::new("Servers").size(11.0).color(egui::Color32::GRAY));
+                    });
+                });
+            });
+        });
+    });
+}
+
+/// Render search and filter controls
+pub fn render_search_controls(ui: &mut egui::Ui, admin_state: &mut AdminState) -> bool {
+    let mut changed = false;
+    
+    ui.group(|ui| {
+        ui.set_min_width(ui.available_width());
+        ui.vertical(|ui| {
+            ui.label(egui::RichText::new("🔍 Search").size(16.0).strong());
+            ui.add_space(8.0);
+            
+            // Search field with full width
+            ui.horizontal(|ui| {
+                ui.label(egui::RichText::new("🔍").size(14.0));
+                let search_response = ui.add_sized(
+                    [ui.available_width() * 0.6, 20.0],
+                    egui::TextEdit::singleline(&mut admin_state.search_term)
+                        .hint_text("Search servers or keys...")
+                );
+                
+                if admin_state.search_term.is_empty() {
+                    ui.label(egui::RichText::new("Type to search").size(11.0).color(egui::Color32::GRAY));
+                } else {
+                    ui.label(egui::RichText::new(format!("{} results", admin_state.filtered_keys.len())).size(11.0));
+                    if ui.add(egui::Button::new(egui::RichText::new("❌").color(egui::Color32::WHITE))
+                        .fill(egui::Color32::from_rgb(170, 170, 170))
+                        .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(89, 89, 89)))
+                        .rounding(egui::Rounding::same(3.0))
+                        .min_size(egui::vec2(18.0, 18.0))
+                    ).on_hover_text("Clear search").clicked() {
+                        admin_state.search_term.clear();
+                        changed = true;
+                    }
+                }
+                
+                // Handle search text changes
+                if search_response.changed() {
+                    changed = true;
+                }
+            });
+            
+            ui.add_space(5.0);
+            
+            // Filter controls
+            ui.horizontal(|ui| {
+                ui.label("Filter:");
+                let show_deprecated = admin_state.show_deprecated_only;
+                if ui.selectable_label(!show_deprecated, "✅ Active").clicked() {
+                    admin_state.show_deprecated_only = false;
+                    changed = true;
+                }
+                if ui.selectable_label(show_deprecated, "❗ Deprecated").clicked() {
+                    admin_state.show_deprecated_only = true;
+                    changed = true;
+                }
+            });
+        });
+    });
+    
+    if changed {
+        admin_state.filter_keys();
+    }
+    
+    changed
+}
+
+/// Render bulk actions controls
+pub fn render_bulk_actions(ui: &mut egui::Ui, admin_state: &mut AdminState) -> BulkAction {
+    let selected_count = admin_state.selected_servers.values().filter(|&&v| v).count();
+    
+    if selected_count == 0 {
+        return BulkAction::None;
+    }
+    
+    let mut action = BulkAction::None;
+    
+    ui.group(|ui| {
+        ui.set_min_width(ui.available_width());
+        ui.vertical(|ui| {
+            ui.horizontal(|ui| {
+                ui.label(egui::RichText::new("📋").size(14.0));
+                ui.label(egui::RichText::new(format!("Selected {} servers", selected_count))
+                    .size(14.0)
+                    .strong()
+                    .color(egui::Color32::LIGHT_BLUE));
+            });
+            
+            ui.add_space(5.0);
+            
+            ui.horizontal(|ui| {
+                if ui.add(egui::Button::new(egui::RichText::new("❗ Deprecate Selected").color(egui::Color32::BLACK))
+                    .fill(egui::Color32::from_rgb(255, 200, 0))
+                    .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(102, 94, 72)))
+                    .rounding(egui::Rounding::same(6.0))
+                    .min_size(egui::vec2(130.0, 28.0))
+                ).clicked() {
+                    action = BulkAction::DeprecateSelected;
+                }
+                
+                if ui.add(egui::Button::new(egui::RichText::new("✅ Restore Selected").color(egui::Color32::WHITE))
+                    .fill(egui::Color32::from_rgb(101, 199, 40))
+                    .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(94, 105, 25)))
+                    .rounding(egui::Rounding::same(6.0))
+                    .min_size(egui::vec2(120.0, 28.0))
+                ).clicked() {
+                    action = BulkAction::RestoreSelected;
+                }
+                
+                if ui.add(egui::Button::new(egui::RichText::new("X Clear Selection").color(egui::Color32::WHITE))
+                    .fill(egui::Color32::from_rgb(170, 170, 170))
+                    .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(89, 89, 89)))
+                    .rounding(egui::Rounding::same(6.0))
+                    .min_size(egui::vec2(110.0, 28.0))
+                ).clicked() {
+                    admin_state.clear_selection();
+                    action = BulkAction::ClearSelection;
+                }
+            });
+        });
+    });
+    
+    action
+}
+
+/// Render keys table grouped by servers
+pub fn render_keys_table(ui: &mut egui::Ui, admin_state: &mut AdminState) -> KeyAction {
+    if admin_state.filtered_keys.is_empty() {
+        render_empty_state(ui, admin_state);
+        return KeyAction::None;
+    }
+    
+    let mut action = KeyAction::None;
+    
+    // Group keys by server
+    let mut servers: BTreeMap<String, Vec<SshKey>> = BTreeMap::new();
+    for key in &admin_state.filtered_keys {
+        servers.entry(key.server.clone()).or_insert_with(Vec::new).push(key.clone());
+    }
+    
+    // Render each server group
+    for (server_name, server_keys) in servers {
+        let is_expanded = admin_state.expanded_servers.get(&server_name).copied().unwrap_or(false);
+        let active_count = server_keys.iter().filter(|k| !k.deprecated).count();
+        let deprecated_count = server_keys.len() - active_count;
+        
+        // Server header
+        ui.group(|ui| {
+            ui.horizontal(|ui| {
+                // Server selection checkbox
+                let mut selected = admin_state.selected_servers.get(&server_name).copied().unwrap_or(false);
+                if ui.add(egui::Checkbox::new(&mut selected, "")
+                    .indeterminate(false)
+                ).changed() {
+                    admin_state.selected_servers.insert(server_name.clone(), selected);
+                }
+                
+                // Expand/collapse button
+                let expand_icon = if is_expanded { "▼" } else { "▶" };
+                if ui.add(egui::Button::new(expand_icon)
+                    .fill(egui::Color32::TRANSPARENT)
+                    .stroke(egui::Stroke::NONE)
+                    .min_size(egui::vec2(20.0, 20.0))
+                ).clicked() {
+                    admin_state.expanded_servers.insert(server_name.clone(), !is_expanded);
+                }
+                
+                // Server icon and name
+                ui.label(egui::RichText::new("💻").size(16.0));
+                ui.label(egui::RichText::new(&server_name)
+                    .size(15.0)
+                    .strong()
+                    .color(egui::Color32::WHITE));
+                
+                // Keys count badge
+                render_badge(ui, &format!("{} keys", server_keys.len()), egui::Color32::from_rgb(52, 152, 219), egui::Color32::WHITE);
+                
+                ui.add_space(5.0);
+                
+                // Deprecated count badge
+                if deprecated_count > 0 {
+                    render_badge(ui, &format!("{} depr", deprecated_count), egui::Color32::from_rgb(231, 76, 60), egui::Color32::WHITE);
+                }
+                
+                ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                    // Server action buttons
+                    if deprecated_count > 0 {
+                        if ui.add(egui::Button::new(egui::RichText::new("✅ Restore").color(egui::Color32::WHITE))
+                            .fill(egui::Color32::from_rgb(101, 199, 40))
+                            .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(94, 105, 25)))
+                            .rounding(egui::Rounding::same(4.0))
+                            .min_size(egui::vec2(70.0, 24.0))
+                        ).clicked() {
+                            action = KeyAction::RestoreServer(server_name.clone());
+                        }
+                    }
+                    
+                    if active_count > 0 {
+                        if ui.add(egui::Button::new(egui::RichText::new("❗ Deprecate").color(egui::Color32::BLACK))
+                            .fill(egui::Color32::from_rgb(255, 200, 0))
+                            .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(102, 94, 72)))
+                            .rounding(egui::Rounding::same(4.0))
+                            .min_size(egui::vec2(85.0, 24.0))
+                        ).clicked() {
+                            action = KeyAction::DeprecateServer(server_name.clone());
+                        }
+                    }
+                });
+            });
+        });
+        
+        // Expanded key details
+        if is_expanded {
+            ui.indent("server_keys", |ui| {
+                for key in &server_keys {
+                    if let Some(key_action) = render_key_item(ui, key, &server_name) {
+                        action = key_action;
+                    }
+                }
+            });
+        }
+        
+        ui.add_space(5.0);
+    }
+    
+    action
+}
+
+/// Render empty state when no keys are available
+fn render_empty_state(ui: &mut egui::Ui, admin_state: &AdminState) {
+    ui.vertical_centered(|ui| {
+        ui.add_space(60.0);
+        if admin_state.keys.is_empty() {
+            ui.label(egui::RichText::new("🔑").size(48.0).color(egui::Color32::GRAY));
+            ui.label(egui::RichText::new("No SSH keys available")
+                .size(18.0)
+                .color(egui::Color32::GRAY));
+            ui.label(egui::RichText::new("Keys will appear here once loaded from the server")
+                .size(14.0)
+                .color(egui::Color32::DARK_GRAY));
+        } else if !admin_state.search_term.is_empty() {
+            ui.label(egui::RichText::new("🔍").size(48.0).color(egui::Color32::GRAY));
+            ui.label(egui::RichText::new("No results found")
+                .size(18.0)
+                .color(egui::Color32::GRAY));
+            ui.label(egui::RichText::new(format!("Try adjusting your search: '{}'", admin_state.search_term))
+                .size(14.0)
+                .color(egui::Color32::DARK_GRAY));
+        } else {
+            ui.label(egui::RichText::new("❌").size(48.0).color(egui::Color32::GRAY));
+            ui.label(egui::RichText::new("No keys match current filters")
+                .size(18.0)
+                .color(egui::Color32::GRAY));
+            ui.label(egui::RichText::new("Try adjusting your search or filter settings")
+                .size(14.0)
+                .color(egui::Color32::DARK_GRAY));
+        }
+    });
+}
+
+/// Render individual key item
+fn render_key_item(ui: &mut egui::Ui, key: &SshKey, server_name: &str) -> Option<KeyAction> {
+    let mut action = None;
+    
+    ui.group(|ui| {
+        ui.horizontal(|ui| {
+            // Key type badge
+            let key_type = get_key_type(&key.public_key);
+            let (badge_color, text_color) = match key_type.as_str() {
+                "RSA" => (egui::Color32::from_rgb(52, 144, 220), egui::Color32::WHITE),
+                "ED25519" => (egui::Color32::from_rgb(46, 204, 113), egui::Color32::WHITE),
+                "ECDSA" => (egui::Color32::from_rgb(241, 196, 15), egui::Color32::BLACK),
+                "DSA" => (egui::Color32::from_rgb(230, 126, 34), egui::Color32::WHITE),
+                _ => (egui::Color32::GRAY, egui::Color32::WHITE),
+            };
+            
+            render_small_badge(ui, &key_type, badge_color, text_color);
+            ui.add_space(5.0);
+            
+            // Status badge
+            if key.deprecated {
+                ui.label(egui::RichText::new("❗ DEPR")
+                    .size(10.0)
+                    .color(egui::Color32::from_rgb(231, 76, 60))
+                    .strong());
+            } else {
+                ui.label(egui::RichText::new("[OK] ACTIVE")
+                    .size(10.0)
+                    .color(egui::Color32::from_rgb(46, 204, 113))
+                    .strong());
+            }
+            
+            ui.add_space(5.0);
+            
+            // Key preview
+            ui.label(egui::RichText::new(get_key_preview(&key.public_key))
+                .font(egui::FontId::monospace(10.0))
+                .color(egui::Color32::LIGHT_GRAY));
+            
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                // Key action buttons
+                if key.deprecated {
+                    if ui.add(egui::Button::new(egui::RichText::new("[R]").color(egui::Color32::WHITE))
+                        .fill(egui::Color32::from_rgb(101, 199, 40))
+                        .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(94, 105, 25)))
+                        .rounding(egui::Rounding::same(3.0))
+                        .min_size(egui::vec2(22.0, 18.0))
+                    ).on_hover_text("Restore key").clicked() {
+                        action = Some(KeyAction::RestoreKey(server_name.to_string()));
+                    }
+                    if ui.add(egui::Button::new(egui::RichText::new("Del").color(egui::Color32::WHITE))
+                        .fill(egui::Color32::from_rgb(246, 36, 71))
+                        .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(129, 18, 17)))
+                        .rounding(egui::Rounding::same(3.0))
+                        .min_size(egui::vec2(26.0, 18.0))
+                    ).on_hover_text("Delete key").clicked() {
+                        action = Some(KeyAction::DeleteKey(server_name.to_string()));
+                    }
+                } else {
+                    if ui.add(egui::Button::new(egui::RichText::new("❗").color(egui::Color32::BLACK))
+                        .fill(egui::Color32::from_rgb(255, 200, 0))
+                        .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(102, 94, 72)))
+                        .rounding(egui::Rounding::same(3.0))
+                        .min_size(egui::vec2(22.0, 18.0))
+                    ).on_hover_text("Deprecate key").clicked() {
+                        action = Some(KeyAction::DeprecateKey(server_name.to_string()));
+                    }
+                }
+                
+                if ui.add(egui::Button::new(egui::RichText::new("Copy").color(egui::Color32::WHITE))
+                    .fill(egui::Color32::from_rgb(0, 111, 230))
+                    .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(35, 84, 97)))
+                    .rounding(egui::Rounding::same(3.0))
+                    .min_size(egui::vec2(30.0, 18.0))
+                ).on_hover_text("Copy to clipboard").clicked() {
+                    ui.output_mut(|o| o.copied_text = key.public_key.clone());
+                }
+            });
+        });
+    });
+    
+    action
+}
+
+/// Render a badge with text
+fn render_badge(ui: &mut egui::Ui, text: &str, bg_color: egui::Color32, text_color: egui::Color32) {
+    let (rect, _) = ui.allocate_exact_size(
+        egui::vec2(50.0, 18.0),
+        egui::Sense::hover()
+    );
+    ui.painter().rect_filled(
+        rect,
+        egui::Rounding::same(8.0),
+        bg_color
+    );
+    ui.painter().text(
+        rect.center(),
+        egui::Align2::CENTER_CENTER,
+        text,
+        egui::FontId::proportional(10.0),
+        text_color,
+    );
+}
+
+/// Render a small badge with text
+fn render_small_badge(ui: &mut egui::Ui, text: &str, bg_color: egui::Color32, text_color: egui::Color32) {
+    let (rect, _) = ui.allocate_exact_size(
+        egui::vec2(40.0, 16.0),
+        egui::Sense::hover()
+    );
+    ui.painter().rect_filled(
+        rect,
+        egui::Rounding::same(3.0),
+        bg_color
+    );
+    ui.painter().text(
+        rect.center(),
+        egui::Align2::CENTER_CENTER,
+        text,
+        egui::FontId::proportional(9.0),
+        text_color,
+    );
+}
+
+/// Actions that can be performed on keys
+#[derive(Debug, Clone)]
+pub enum KeyAction {
+    None,
+    DeprecateKey(String),
+    RestoreKey(String),
+    DeleteKey(String),
+    DeprecateServer(String),
+    RestoreServer(String),
+}
+
+/// Bulk actions that can be performed
+#[derive(Debug, Clone)]
+pub enum BulkAction {
+    None,
+    DeprecateSelected,
+    RestoreSelected,
+    ClearSelection,
+}

src/gui/api/client.rs

@@ -0,0 +1,254 @@
+use reqwest::Client;
+use log::info;
+use serde::{Deserialize, Serialize};
+use crate::gui::common::{KhmSettings, perform_sync};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SshKey {
+    pub server: String,
+    pub public_key: String,
+    #[serde(default)]
+    pub deprecated: bool,
+}
+
+/// Test connection to KHM server
+pub async fn test_connection(host: String, flow: String, basic_auth: String) -> Result<String, String> {
+    if host.is_empty() || flow.is_empty() {
+        return Err("Host and flow must be specified".to_string());
+    }
+    
+    let url = format!("{}/{}/keys", host.trim_end_matches('/'), flow);
+    info!("Testing connection to: {}", url);
+    
+    let client = create_http_client()?;
+    let mut request = client.get(&url);
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    check_html_response(&body)?;
+    
+    let keys: Vec<SshKey> = serde_json::from_str(&body)
+        .map_err(|e| format!("Failed to parse response: {}", e))?;
+    
+    let message = format!("Found {} SSH keys from flow '{}'", keys.len(), flow);
+    info!("Connection test successful: {}", message);
+    Ok(message)
+}
+
+/// Fetch all SSH keys including deprecated ones
+pub async fn fetch_keys(host: String, flow: String, basic_auth: String) -> Result<Vec<SshKey>, String> {
+    if host.is_empty() || flow.is_empty() {
+        return Err("Host and flow must be specified".to_string());
+    }
+    
+    let url = format!("{}/{}/keys?include_deprecated=true", host.trim_end_matches('/'), flow);
+    info!("Fetching keys from: {}", url);
+    
+    let client = create_http_client()?;
+    let mut request = client.get(&url);
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    check_html_response(&body)?;
+    
+    let keys: Vec<SshKey> = serde_json::from_str(&body)
+        .map_err(|e| format!("Failed to parse response: {}", e))?;
+    
+    info!("Fetched {} SSH keys", keys.len());
+    Ok(keys)
+}
+
+/// Deprecate a key for a specific server
+pub async fn deprecate_key(host: String, flow: String, basic_auth: String, server: String) -> Result<String, String> {
+    let url = format!("{}/{}/keys/{}", host.trim_end_matches('/'), flow, urlencoding::encode(&server));
+    info!("Deprecating key for server '{}' at: {}", server, url);
+    
+    let client = create_http_client()?;
+    let mut request = client.delete(&url);
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    parse_api_response(&body, &format!("Successfully deprecated key for server '{}'", server))
+}
+
+/// Restore a key for a specific server
+pub async fn restore_key(host: String, flow: String, basic_auth: String, server: String) -> Result<String, String> {
+    let url = format!("{}/{}/keys/{}/restore", host.trim_end_matches('/'), flow, urlencoding::encode(&server));
+    info!("Restoring key for server '{}' at: {}", server, url);
+    
+    let client = create_http_client()?;
+    let mut request = client.post(&url);
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    parse_api_response(&body, &format!("Successfully restored key for server '{}'", server))
+}
+
+/// Delete a key permanently for a specific server
+pub async fn delete_key(host: String, flow: String, basic_auth: String, server: String) -> Result<String, String> {
+    let url = format!("{}/{}/keys/{}/delete", host.trim_end_matches('/'), flow, urlencoding::encode(&server));
+    info!("Permanently deleting key for server '{}' at: {}", server, url);
+    
+    let client = create_http_client()?;
+    let mut request = client.delete(&url);
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    parse_api_response(&body, &format!("Successfully deleted key for server '{}'", server))
+}
+
+/// Bulk deprecate multiple servers
+pub async fn bulk_deprecate_servers(host: String, flow: String, basic_auth: String, servers: Vec<String>) -> Result<String, String> {
+    let url = format!("{}/{}/bulk-deprecate", host.trim_end_matches('/'), flow);
+    info!("Bulk deprecating {} servers at: {}", servers.len(), url);
+    
+    let client = create_http_client()?;
+    let mut request = client.post(&url)
+        .json(&serde_json::json!({
+            "servers": servers
+        }));
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    parse_api_response(&body, "Successfully deprecated servers")
+}
+
+/// Bulk restore multiple servers
+pub async fn bulk_restore_servers(host: String, flow: String, basic_auth: String, servers: Vec<String>) -> Result<String, String> {
+    let url = format!("{}/{}/bulk-restore", host.trim_end_matches('/'), flow);
+    info!("Bulk restoring {} servers at: {}", servers.len(), url);
+    
+    let client = create_http_client()?;
+    let mut request = client.post(&url)
+        .json(&serde_json::json!({
+            "servers": servers
+        }));
+    
+    request = add_auth_if_needed(request, &basic_auth)?;
+    
+    let response = request.send().await
+        .map_err(|e| format!("Request failed: {}", e))?;
+    
+    check_response_status(&response)?;
+    
+    let body = response.text().await
+        .map_err(|e| format!("Failed to read response: {}", e))?;
+    
+    parse_api_response(&body, "Successfully restored servers")
+}
+
+/// Perform manual sync operation
+pub async fn perform_manual_sync(settings: KhmSettings) -> Result<String, String> {
+    match perform_sync(&settings).await {
+        Ok(keys_count) => Ok(format!("Sync completed successfully with {} keys", keys_count)),
+        Err(e) => Err(e.to_string()),
+    }
+}
+
+// Helper functions
+
+fn create_http_client() -> Result<Client, String> {
+    Client::builder()
+        .timeout(std::time::Duration::from_secs(30))
+        .redirect(reqwest::redirect::Policy::none())
+        .build()
+        .map_err(|e| format!("Failed to create HTTP client: {}", e))
+}
+
+fn add_auth_if_needed(request: reqwest::RequestBuilder, basic_auth: &str) -> Result<reqwest::RequestBuilder, String> {
+    if basic_auth.is_empty() {
+        return Ok(request);
+    }
+    
+    let auth_parts: Vec<&str> = basic_auth.splitn(2, ':').collect();
+    if auth_parts.len() == 2 {
+        Ok(request.basic_auth(auth_parts[0], Some(auth_parts[1])))
+    } else {
+        Err("Basic auth format should be 'username:password'".to_string())
+    }
+}
+
+fn check_response_status(response: &reqwest::Response) -> Result<(), String> {
+    let status = response.status().as_u16();
+    
+    if status == 401 {
+        return Err("Authentication required. Please provide valid basic auth credentials.".to_string());
+    }
+    
+    if status >= 300 && status < 400 {
+        return Err("Server redirects to login page. Authentication may be required.".to_string());
+    }
+    
+    if !response.status().is_success() {
+        return Err(format!("Server returned error: {} {}", status, response.status().canonical_reason().unwrap_or("Unknown")));
+    }
+    
+    Ok(())
+}
+
+fn check_html_response(body: &str) -> Result<(), String> {
+    if body.trim_start().starts_with("<!DOCTYPE") || body.trim_start().starts_with("<html") {
+        return Err("Server returned HTML page instead of JSON. This usually means authentication is required or the endpoint is incorrect.".to_string());
+    }
+    Ok(())
+}
+
+fn parse_api_response(body: &str, default_message: &str) -> Result<String, String> {
+    if let Ok(json_response) = serde_json::from_str::<serde_json::Value>(body) {
+        if let Some(message) = json_response.get("message").and_then(|v| v.as_str()) {
+            Ok(message.to_string())
+        } else {
+            Ok(default_message.to_string())
+        }
+    } else {
+        Ok(default_message.to_string())
+    }
+}

src/gui/api/mod.rs

@@ -0,0 +1,3 @@
+mod client;
+
+pub use client::*;

src/gui/common/mod.rs

@@ -0,0 +1,3 @@
+mod settings;
+
+pub use settings::*;

src/gui/common/settings.rs

@@ -0,0 +1,143 @@
+use dirs::home_dir;
+use log::{debug, error, info};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct KhmSettings {
+    pub host: String,
+    pub flow: String,
+    pub known_hosts: String,
+    pub basic_auth: String,
+    pub in_place: bool,
+    pub auto_sync_interval_minutes: u32,
+}
+
+impl Default for KhmSettings {
+    fn default() -> Self {
+        Self {
+            host: String::new(),
+            flow: String::new(),
+            known_hosts: get_default_known_hosts_path(),
+            basic_auth: String::new(),
+            in_place: true,
+            auto_sync_interval_minutes: 60,
+        }
+    }
+}
+
+/// Get default known_hosts file path based on OS
+fn get_default_known_hosts_path() -> String {
+    #[cfg(target_os = "windows")]
+    {
+        if let Ok(user_profile) = std::env::var("USERPROFILE") {
+            format!("{}/.ssh/known_hosts", user_profile)
+        } else {
+            "~/.ssh/known_hosts".to_string()
+        }
+    }
+    #[cfg(not(target_os = "windows"))]
+    {
+        "~/.ssh/known_hosts".to_string()
+    }
+}
+
+/// Get configuration file path
+pub fn get_config_path() -> PathBuf {
+    let mut path = home_dir().expect("Could not find home directory");
+    path.push(".khm");
+    fs::create_dir_all(&path).ok();
+    path.push("khm_config.json");
+    path
+}
+
+/// Load settings from configuration file
+pub fn load_settings() -> KhmSettings {
+    let path = get_config_path();
+    match fs::read_to_string(&path) {
+        Ok(contents) => {
+            let mut settings: KhmSettings = serde_json::from_str(&contents).unwrap_or_else(|e| {
+                error!("Failed to parse KHM config: {}", e);
+                KhmSettings::default()
+            });
+            
+            // Fill in default known_hosts path if empty
+            if settings.known_hosts.is_empty() {
+                settings.known_hosts = get_default_known_hosts_path();
+            }
+            
+            settings
+        }
+        Err(_) => {
+            debug!("KHM config file not found, using defaults");
+            KhmSettings::default()
+        }
+    }
+}
+
+/// Save settings to configuration file
+pub fn save_settings(settings: &KhmSettings) -> Result<(), std::io::Error> {
+    let path = get_config_path();
+    let json = serde_json::to_string_pretty(settings)?;
+    fs::write(&path, json)?;
+    info!("KHM settings saved");
+    Ok(())
+}
+
+/// Expand path with ~ substitution
+pub fn expand_path(path: &str) -> String {
+    if path.starts_with("~/") {
+        if let Some(home) = home_dir() {
+            return home.join(&path[2..]).to_string_lossy().to_string();
+        }
+    }
+    path.to_string()
+}
+
+/// Perform sync operation using KHM client logic
+pub async fn perform_sync(settings: &KhmSettings) -> Result<usize, std::io::Error> {
+    use crate::Args;
+    
+    info!("Starting sync with settings: host={}, flow={}, known_hosts={}, in_place={}", 
+          settings.host, settings.flow, settings.known_hosts, settings.in_place);
+    
+    // Convert KhmSettings to Args for client module
+    let args = Args {
+        server: false,
+        gui: false,
+        settings_ui: false,
+        in_place: settings.in_place,
+        flows: vec!["default".to_string()], // Not used in client mode
+        ip: "127.0.0.1".to_string(),      // Not used in client mode
+        port: 8080,                       // Not used in client mode
+        db_host: "127.0.0.1".to_string(), // Not used in client mode
+        db_name: "khm".to_string(),       // Not used in client mode
+        db_user: None,                    // Not used in client mode
+        db_password: None,                // Not used in client mode
+        host: Some(settings.host.clone()),
+        flow: Some(settings.flow.clone()),
+        known_hosts: expand_path(&settings.known_hosts),
+        basic_auth: settings.basic_auth.clone(),
+    };
+    
+    info!("Expanded known_hosts path: {}", args.known_hosts);
+    
+    // Get keys count before and after sync
+    let keys_before = crate::client::read_known_hosts(&args.known_hosts)
+        .unwrap_or_else(|_| Vec::new())
+        .len();
+    
+    crate::client::run_client(args.clone()).await?;
+    
+    let keys_after = if args.in_place {
+        crate::client::read_known_hosts(&args.known_hosts)
+            .unwrap_or_else(|_| Vec::new())
+            .len()
+    } else {
+        keys_before
+    };
+    
+    info!("Sync completed: {} keys before, {} keys after", keys_before, keys_after);
+    Ok(keys_after)
+}

src/gui/mod.rs

@@ -0,0 +1,43 @@
+use log::info;
+
+// Modules
+mod api;
+mod admin;
+mod common;
+
+#[cfg(feature = "gui")]
+mod settings;
+#[cfg(feature = "gui")]
+mod tray;
+
+// Re-exports for backward compatibility and external usage
+#[cfg(feature = "gui")]
+pub use settings::run_settings_window;
+#[cfg(feature = "gui")]
+pub use tray::run_tray_app;
+
+// User events for GUI communication
+#[cfg(feature = "gui")]
+#[derive(Debug)]
+pub enum UserEvent {
+    TrayIconEvent,
+    MenuEvent(tray_icon::menu::MenuEvent),
+    ConfigFileChanged,
+    UpdateMenu,
+}
+
+/// Run GUI application in tray mode
+#[cfg(feature = "gui")]
+pub async fn run_gui() -> std::io::Result<()> {
+    info!("Starting KHM tray application");
+    run_tray_app().await
+}
+
+/// Stub function when GUI is disabled
+#[cfg(not(feature = "gui"))]
+pub async fn run_gui() -> std::io::Result<()> {
+    return Err(std::io::Error::new(
+        std::io::ErrorKind::Unsupported,
+        "GUI features not compiled. Install system dependencies and rebuild with --features gui"
+    ));
+}

src/gui/settings/connection.rs

@@ -0,0 +1,202 @@
+use eframe::egui;
+use log::{error, info};
+use std::sync::mpsc;
+use crate::gui::api::{test_connection, perform_manual_sync};
+use crate::gui::common::{KhmSettings, save_settings};
+
+#[derive(Debug, Clone)]
+pub enum ConnectionStatus {
+    Unknown,
+    Connected { keys_count: usize, flow: String },
+    Error(String),
+}
+
+#[derive(Debug, Clone)]
+pub enum SyncStatus {
+    Unknown,
+    Success { keys_count: usize },
+    Error(String),
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum SettingsTab {
+    Connection,
+    Admin,
+}
+
+pub struct ConnectionTab {
+    pub connection_status: ConnectionStatus,
+    pub is_testing_connection: bool,
+    pub test_result_receiver: Option<mpsc::Receiver<Result<String, String>>>,
+    pub is_syncing: bool,
+    pub sync_result_receiver: Option<mpsc::Receiver<Result<String, String>>>,
+    pub sync_status: SyncStatus,
+}
+
+impl Default for ConnectionTab {
+    fn default() -> Self {
+        Self {
+            connection_status: ConnectionStatus::Unknown,
+            is_testing_connection: false,
+            test_result_receiver: None,
+            is_syncing: false,
+            sync_result_receiver: None,
+            sync_status: SyncStatus::Unknown,
+        }
+    }
+}
+
+impl ConnectionTab {
+    /// Start connection test
+    pub fn start_test(&mut self, settings: &KhmSettings, ctx: &egui::Context) {
+        if self.is_testing_connection {
+            return;
+        }
+        
+        self.is_testing_connection = true;
+        self.connection_status = ConnectionStatus::Unknown;
+        
+        let (tx, rx) = mpsc::channel();
+        self.test_result_receiver = Some(rx);
+        
+        let host = settings.host.clone();
+        let flow = settings.flow.clone();
+        let basic_auth = settings.basic_auth.clone();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                test_connection(host, flow, basic_auth).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+    
+    /// Start manual sync
+    pub fn start_sync(&mut self, settings: &KhmSettings, ctx: &egui::Context) {
+        if self.is_syncing {
+            return;
+        }
+        
+        self.is_syncing = true;
+        self.sync_status = SyncStatus::Unknown;
+        
+        let (tx, rx) = mpsc::channel();
+        self.sync_result_receiver = Some(rx);
+        
+        let settings = settings.clone();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                perform_manual_sync(settings).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+    
+    /// Check for test/sync results
+    pub fn check_results(&mut self, ctx: &egui::Context, settings: &KhmSettings, operation_log: &mut Vec<String>) {
+        // Check for test connection result
+        if let Some(receiver) = &self.test_result_receiver {
+            if let Ok(result) = receiver.try_recv() {
+                self.is_testing_connection = false;
+                match result {
+                    Ok(message) => {
+                        // Parse keys count from message
+                        let keys_count = if let Some(start) = message.find("Found ") {
+                            if let Some(end) = message[start + 6..].find(" SSH keys") {
+                                message[start + 6..start + 6 + end].parse::<usize>().unwrap_or(0)
+                            } else { 0 }
+                        } else { 0 };
+                        
+                        self.connection_status = ConnectionStatus::Connected { 
+                            keys_count, 
+                            flow: settings.flow.clone()
+                        };
+                        info!("Connection test successful: {}", message);
+                        
+                        // Add to UI log
+                        super::ui::add_log_entry(operation_log, format!("✅ Connection test successful: {}", message));
+                    }
+                    Err(error) => {
+                        self.connection_status = ConnectionStatus::Error(error.clone());
+                        error!("Connection test failed");
+                        
+                        // Add to UI log
+                        super::ui::add_log_entry(operation_log, format!("❌ Connection test failed: {}", error));
+                    }
+                }
+                self.test_result_receiver = None;
+                ctx.request_repaint();
+            }
+        }
+        
+        // Check for sync result
+        if let Some(receiver) = &self.sync_result_receiver {
+            if let Ok(result) = receiver.try_recv() {
+                self.is_syncing = false;
+                match result {
+                    Ok(message) => {
+                        // Parse keys count from message
+                        let keys_count = parse_keys_count(&message);
+                        self.sync_status = SyncStatus::Success { keys_count };
+                        info!("Sync successful: {}", message);
+                        
+                        // Add to UI log
+                        super::ui::add_log_entry(operation_log, format!("✅ Sync completed: {}", message));
+                    }
+                    Err(error) => {
+                        self.sync_status = SyncStatus::Error(error.clone());
+                        error!("Sync failed");
+                        
+                        // Add to UI log
+                        super::ui::add_log_entry(operation_log, format!("❌ Sync failed: {}", error));
+                    }
+                }
+                self.sync_result_receiver = None;
+                ctx.request_repaint();
+            }
+        }
+    }
+}
+
+/// Parse keys count from sync result message
+fn parse_keys_count(message: &str) -> usize {
+    if let Some(start) = message.find("updated with ") {
+        let search_start = start + "updated with ".len();
+        if let Some(end) = message[search_start..].find(" keys") {
+            let number_str = &message[search_start..search_start + end];
+            return number_str.parse::<usize>().unwrap_or(0);
+        }
+    } else if let Some(start) = message.find("Retrieved ") {
+        let search_start = start + "Retrieved ".len();
+        if let Some(end) = message[search_start..].find(" keys") {
+            let number_str = &message[search_start..search_start + end];
+            return number_str.parse::<usize>().unwrap_or(0);
+        }
+    } else if let Some(keys_pos) = message.find(" keys") {
+        let before_keys = &message[..keys_pos];
+        if let Some(space_pos) = before_keys.rfind(' ') {
+            let number_str = &before_keys[space_pos + 1..];
+            return number_str.parse::<usize>().unwrap_or(0);
+        }
+    }
+    
+    0
+}
+
+/// Save settings with validation
+pub fn save_settings_validated(settings: &KhmSettings) -> Result<(), String> {
+    if settings.host.is_empty() || settings.flow.is_empty() {
+        return Err("Host URL and Flow Name are required".to_string());
+    }
+    
+    save_settings(settings).map_err(|e| format!("Failed to save settings: {}", e))
+}

src/gui/settings/mod.rs

@@ -0,0 +1,5 @@
+mod connection;
+mod ui;
+mod window;
+
+pub use window::*;

src/gui/settings/ui.rs

@@ -0,0 +1,549 @@
+use eframe::egui;
+use crate::gui::common::{KhmSettings, get_config_path};
+use super::connection::{ConnectionTab, ConnectionStatus, SyncStatus, save_settings_validated};
+
+/// Render connection settings tab with modern horizontal UI design
+pub fn render_connection_tab(
+    ui: &mut egui::Ui, 
+    ctx: &egui::Context,
+    settings: &mut KhmSettings,
+    auto_sync_interval_str: &mut String,
+    connection_tab: &mut ConnectionTab,
+    operation_log: &mut Vec<String>
+) {
+    // Check for connection test and sync results
+    connection_tab.check_results(ctx, settings, operation_log);
+    
+    // Use scrollable area for the entire content
+    egui::ScrollArea::vertical()
+        .auto_shrink([false; 2])
+        .show(ui, |ui| {
+            ui.spacing_mut().item_spacing = egui::vec2(6.0, 8.0);
+            ui.spacing_mut().button_padding = egui::vec2(12.0, 6.0);
+            ui.spacing_mut().indent = 16.0;
+            
+            // Connection Status Card at top (full width)
+            render_connection_status_card(ui, connection_tab);
+            
+            // Main configuration area - horizontal layout
+            ui.horizontal_top(|ui| {
+                let available_width = ui.available_width();
+                let left_panel_width = available_width * 0.6;
+                let right_panel_width = available_width * 0.38;
+                
+                // Left panel - Connection and Local config
+                ui.allocate_ui_with_layout(
+                    [left_panel_width, ui.available_height()].into(),
+                    egui::Layout::top_down(egui::Align::Min),
+                    |ui| {
+                        // Connection Configuration Card
+                        render_connection_config_card(ui, settings);
+                        
+                        // Local Configuration Card
+                        render_local_config_card(ui, settings);
+                    }
+                );
+                
+                ui.add_space(8.0);
+                
+                // Right panel - Auto-sync and System info
+                ui.allocate_ui_with_layout(
+                    [right_panel_width, ui.available_height()].into(),
+                    egui::Layout::top_down(egui::Align::Min),
+                    |ui| {
+                        // Auto-sync Configuration Card
+                        render_auto_sync_card(ui, settings, auto_sync_interval_str);
+                        
+                        // System Information Card
+                        render_system_info_card(ui);
+                    }
+                );
+            });
+            
+            ui.add_space(12.0);
+            
+            // Action buttons at bottom
+            render_action_section(ui, ctx, settings, connection_tab, operation_log);
+        });
+}
+
+/// Connection status card with modern visual design
+fn render_connection_status_card(ui: &mut egui::Ui, connection_tab: &ConnectionTab) {
+    let frame = egui::Frame::group(ui.style())
+        .fill(ui.visuals().faint_bg_color)
+        .stroke(egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color))
+        .rounding(6.0)
+        .inner_margin(egui::Margin::same(12.0));
+        
+    frame.show(ui, |ui| {
+        // Header with status indicator
+        ui.horizontal(|ui| {
+            let (status_icon, status_text, status_color) = match &connection_tab.connection_status {
+                ConnectionStatus::Connected { keys_count, flow } => {
+                    let text = if flow.is_empty() {
+                        format!("Connected • {} keys", keys_count)
+                    } else {
+                        format!("Connected to '{}' • {} keys", flow, keys_count)
+                    };
+                    ("🟢", text, egui::Color32::GREEN)
+                }
+                ConnectionStatus::Error(error_msg) => {
+                    ("🔴", format!("Connection Error: {}", error_msg), egui::Color32::RED)
+                }
+                ConnectionStatus::Unknown => {
+                    ("⚫", "Not Connected".to_string(), ui.visuals().text_color())
+                }
+            };
+            
+            ui.label(egui::RichText::new(status_icon).size(14.0));
+            ui.label(egui::RichText::new("Connection Status").size(14.0).strong());
+            
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                if connection_tab.is_testing_connection {
+                    ui.spinner();
+                    ui.label(egui::RichText::new("Testing...").italics().color(ui.visuals().weak_text_color()));
+                } else {
+                    ui.label(egui::RichText::new(&status_text).size(13.0).color(status_color));
+                }
+            });
+        });
+        
+        // Sync status - always visible
+        ui.add_space(6.0);
+        ui.separator();
+        ui.add_space(6.0);
+        
+        ui.horizontal(|ui| {
+            ui.label("🔄");
+            ui.label("Last Sync:");
+            
+            match &connection_tab.sync_status {
+                SyncStatus::Success { keys_count } => {
+                    ui.label(egui::RichText::new(format!("✅ {} keys synced", keys_count))
+                        .size(13.0).color(egui::Color32::GREEN));
+                }
+                SyncStatus::Error(error_msg) => {
+                    ui.label(egui::RichText::new("❌ Failed")
+                        .size(13.0).color(egui::Color32::RED))
+                        .on_hover_text(error_msg);
+                }
+                SyncStatus::Unknown => {
+                    ui.label(egui::RichText::new("No sync performed yet")
+                        .size(13.0).color(ui.visuals().weak_text_color()));
+                }
+            }
+        });
+    });
+    
+    ui.add_space(8.0);
+}
+
+/// Connection configuration card with input fields
+fn render_connection_config_card(ui: &mut egui::Ui, settings: &mut KhmSettings) {
+    let frame = egui::Frame::group(ui.style())
+        .fill(ui.visuals().faint_bg_color)
+        .stroke(egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color))
+        .rounding(6.0)
+        .inner_margin(egui::Margin::same(12.0));
+        
+    frame.show(ui, |ui| {
+        // Header
+        ui.horizontal(|ui| {
+            ui.label("🌐");
+            ui.label(egui::RichText::new("Server Configuration").size(14.0).strong());
+        });
+        
+        ui.add_space(8.0);
+        
+        // Input fields with better spacing
+        ui.vertical(|ui| {
+            ui.spacing_mut().item_spacing.y = 8.0;
+            
+            // Host URL
+            ui.vertical(|ui| {
+                ui.label(egui::RichText::new("Host URL").size(13.0).strong());
+                ui.add_space(3.0);
+                ui.add_sized(
+                    [ui.available_width(), 28.0], // Smaller height for better centering
+                    egui::TextEdit::singleline(&mut settings.host)
+                        .hint_text("https://your-khm-server.com")
+                        .font(egui::FontId::new(14.0, egui::FontFamily::Monospace))
+                        .margin(egui::Margin::symmetric(8.0, 6.0)) // Better vertical centering
+                );
+            });
+            
+            // Flow Name
+            ui.vertical(|ui| {
+                ui.label(egui::RichText::new("Flow Name").size(13.0).strong());
+                ui.add_space(3.0);
+                ui.add_sized(
+                    [ui.available_width(), 28.0],
+                    egui::TextEdit::singleline(&mut settings.flow)
+                        .hint_text("production, staging, development")
+                        .font(egui::FontId::new(14.0, egui::FontFamily::Proportional))
+                        .margin(egui::Margin::symmetric(8.0, 6.0))
+                );
+            });
+            
+            // Basic Auth (optional)
+            ui.vertical(|ui| {
+                ui.horizontal(|ui| {
+                    ui.label(egui::RichText::new("Basic Authentication").size(13.0).strong());
+                    ui.label(egui::RichText::new("(optional)").size(12.0).weak().italics());
+                });
+                ui.add_space(3.0);
+                ui.add_sized(
+                    [ui.available_width(), 28.0],
+                    egui::TextEdit::singleline(&mut settings.basic_auth)
+                        .hint_text("username:password")
+                        .password(true)
+                        .font(egui::FontId::new(14.0, egui::FontFamily::Monospace))
+                        .margin(egui::Margin::symmetric(8.0, 6.0))
+                );
+            });
+        });
+    });
+    
+    ui.add_space(8.0);
+}
+
+/// Local configuration card
+fn render_local_config_card(ui: &mut egui::Ui, settings: &mut KhmSettings) {
+    let frame = egui::Frame::group(ui.style())
+        .fill(ui.visuals().faint_bg_color)
+        .stroke(egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color))
+        .rounding(6.0)
+        .inner_margin(egui::Margin::same(12.0));
+        
+    frame.show(ui, |ui| {
+        // Header
+        ui.horizontal(|ui| {
+            ui.label("📁");
+            ui.label(egui::RichText::new("Local Configuration").size(14.0).strong());
+        });
+        
+        ui.add_space(8.0);
+        
+        // Known hosts file
+        ui.vertical(|ui| {
+            ui.label(egui::RichText::new("Known Hosts File Path").size(13.0).strong());
+            ui.add_space(3.0);
+            ui.add_sized(
+                [ui.available_width(), 28.0],
+                egui::TextEdit::singleline(&mut settings.known_hosts)
+                    .hint_text("~/.ssh/known_hosts")
+                    .font(egui::FontId::new(14.0, egui::FontFamily::Monospace))
+                    .margin(egui::Margin::symmetric(8.0, 6.0))
+            );
+            
+            ui.add_space(8.0);
+            
+            // In-place update option with better styling
+            ui.horizontal(|ui| {
+                ui.checkbox(&mut settings.in_place, "");
+                ui.vertical(|ui| {
+                    ui.label(egui::RichText::new("Update file in-place after sync").size(13.0).strong());
+                    ui.label(egui::RichText::new("Automatically modify the known_hosts file when synchronizing").size(12.0).weak().italics());
+                });
+            });
+        });
+    });
+    
+    ui.add_space(8.0);
+}
+
+/// Auto-sync configuration card
+fn render_auto_sync_card(ui: &mut egui::Ui, settings: &mut KhmSettings, auto_sync_interval_str: &mut String) {
+    let frame = egui::Frame::group(ui.style())
+        .fill(ui.visuals().faint_bg_color)
+        .stroke(egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color))
+        .rounding(6.0)
+        .inner_margin(egui::Margin::same(12.0));
+        
+    frame.show(ui, |ui| {
+        let is_auto_sync_enabled = !settings.host.is_empty() 
+            && !settings.flow.is_empty() 
+            && settings.in_place;
+            
+        // Header with status
+        ui.horizontal(|ui| {
+            ui.label("🔄");
+            ui.label(egui::RichText::new("Auto Sync").size(14.0).strong());
+            
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                let (status_text, status_color) = if is_auto_sync_enabled {
+                    ("● Active", egui::Color32::GREEN)
+                } else {
+                    ("○ Inactive", egui::Color32::from_gray(128))
+                };
+                
+                ui.label(egui::RichText::new(status_text).size(12.0).color(status_color));
+            });
+        });
+        
+        ui.add_space(8.0);
+        
+        // Interval setting
+        ui.horizontal(|ui| {
+            ui.label(egui::RichText::new("Interval").size(13.0).strong());
+            ui.add_space(6.0);
+            ui.add_sized(
+            [80.0, 26.0], // Smaller height
+            egui::TextEdit::singleline(auto_sync_interval_str)
+            .font(egui::FontId::new(14.0, egui::FontFamily::Monospace))
+                    .margin(egui::Margin::symmetric(6.0, 5.0))
+        );
+            ui.label("min");
+            
+            // Update the actual setting
+            if let Ok(value) = auto_sync_interval_str.parse::<u32>() {
+                if value > 0 {
+                    settings.auto_sync_interval_minutes = value;
+                }
+            }
+        });
+        
+        // Requirements - always visible
+        ui.add_space(8.0);
+        ui.separator();
+        ui.add_space(8.0);
+        
+        ui.vertical(|ui| {
+            ui.label(egui::RichText::new("Requirements:").size(12.0).strong());
+            ui.add_space(3.0);
+            
+            let host_ok = !settings.host.is_empty();
+            let flow_ok = !settings.flow.is_empty();
+            let in_place_ok = settings.in_place;
+            
+            ui.horizontal(|ui| {
+                let (icon, color) = if host_ok { ("✅", egui::Color32::GREEN) } else { ("❌", egui::Color32::RED) };
+                ui.label(egui::RichText::new(icon).color(color));
+                ui.label(egui::RichText::new("Host URL").size(11.0));
+            });
+            
+            ui.horizontal(|ui| {
+                let (icon, color) = if flow_ok { ("✅", egui::Color32::GREEN) } else { ("❌", egui::Color32::RED) };
+                ui.label(egui::RichText::new(icon).color(color));
+                ui.label(egui::RichText::new("Flow name").size(11.0));
+            });
+            
+            ui.horizontal(|ui| {
+                let (icon, color) = if in_place_ok { ("✅", egui::Color32::GREEN) } else { ("❌", egui::Color32::RED) };
+                ui.label(egui::RichText::new(icon).color(color));
+                ui.label(egui::RichText::new("In-place update").size(11.0));
+            });
+        });
+    });
+    
+    ui.add_space(8.0);
+}
+
+/// System information card
+fn render_system_info_card(ui: &mut egui::Ui) {
+    let frame = egui::Frame::group(ui.style())
+        .fill(ui.visuals().extreme_bg_color)
+        .stroke(egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color))
+        .rounding(6.0)
+        .inner_margin(egui::Margin::same(12.0));
+        
+    frame.show(ui, |ui| {
+        // Header
+        ui.horizontal(|ui| {
+            ui.label("⚙️");
+            ui.label(egui::RichText::new("System Info").size(14.0).strong());
+        });
+        
+        ui.add_space(8.0);
+        
+        // Config file location
+        ui.vertical(|ui| {
+            ui.label(egui::RichText::new("Config File").size(13.0).strong());
+            ui.add_space(3.0);
+            
+            let config_path = get_config_path();
+            let path_str = config_path.display().to_string();
+            
+            ui.vertical(|ui| {
+                ui.add_sized(
+                [ui.available_width(), 26.0], // Smaller height
+                egui::TextEdit::singleline(&mut path_str.clone())
+                .interactive(false)
+                .font(egui::FontId::new(12.0, egui::FontFamily::Monospace))
+                        .margin(egui::Margin::symmetric(8.0, 5.0))
+        );
+                
+                ui.add_space(4.0);
+                
+                if ui.small_button("📋 Copy Path").clicked() {
+                    ui.output_mut(|o| o.copied_text = path_str);
+                }
+            });
+        });
+    });
+    
+    ui.add_space(8.0);
+}
+
+/// Action section with buttons only (Activity Log moved to bottom panel)
+fn render_action_section(
+    ui: &mut egui::Ui, 
+    ctx: &egui::Context,
+    settings: &KhmSettings,
+    connection_tab: &mut ConnectionTab,
+    operation_log: &mut Vec<String>
+) {
+    ui.add_space(8.0);
+    
+    // Validation message
+    let save_enabled = !settings.host.is_empty() && !settings.flow.is_empty();
+    if !save_enabled {
+        ui.horizontal(|ui| {
+            ui.label("⚠️");
+            ui.label(egui::RichText::new("Complete server configuration to enable saving")
+                .size(12.0)
+                .color(egui::Color32::LIGHT_YELLOW)
+                .italics());
+        });
+        ui.add_space(8.0);
+    }
+    
+    // Action buttons with modern styling
+    render_modern_action_buttons(ui, ctx, settings, connection_tab, save_enabled, operation_log);
+}
+
+/// Modern action buttons with improved styling and layout
+fn render_modern_action_buttons(
+    ui: &mut egui::Ui, 
+    ctx: &egui::Context,
+    settings: &KhmSettings,
+    connection_tab: &mut ConnectionTab,
+    save_enabled: bool,
+    operation_log: &mut Vec<String>
+) {
+    ui.horizontal(|ui| {
+        ui.spacing_mut().item_spacing.x = 8.0;
+        
+        // Primary actions (left side)
+        if ui.add_enabled(
+            save_enabled,
+            egui::Button::new(
+                egui::RichText::new("💾 Save & Close")
+                    .size(13.0)
+                    .color(egui::Color32::WHITE)
+            )
+            .fill(if save_enabled { 
+                egui::Color32::from_rgb(0, 120, 212) 
+            } else { 
+                ui.visuals().widgets.inactive.bg_fill 
+            })
+            .min_size(egui::vec2(120.0, 32.0))
+            .rounding(6.0)
+        ).clicked() {
+            match save_settings_validated(settings) {
+                Ok(()) => {
+                    add_log_entry(operation_log, "✅ Settings saved successfully".to_string());
+                    ctx.send_viewport_cmd(egui::ViewportCommand::Close);
+                }
+                Err(e) => {
+                    add_log_entry(operation_log, format!("❌ Failed to save settings: {}", e));
+                }
+            }
+        }
+        
+        if ui.add(
+            egui::Button::new(
+                egui::RichText::new("✖ Cancel")
+                    .size(13.0)
+                    .color(ui.visuals().text_color())
+            )
+            .stroke(egui::Stroke::new(1.0, ui.visuals().text_color()))
+            .fill(egui::Color32::TRANSPARENT)
+            .min_size(egui::vec2(80.0, 32.0))
+            .rounding(6.0)
+        ).clicked() {
+            ctx.send_viewport_cmd(egui::ViewportCommand::Close);
+        }
+        
+        // Spacer
+        ui.add_space(ui.available_width() - 220.0);
+        
+        // Secondary actions (right side)
+        let can_test = !settings.host.is_empty() && !settings.flow.is_empty() && !connection_tab.is_testing_connection;
+        let can_sync = !settings.host.is_empty() && !settings.flow.is_empty() && !connection_tab.is_syncing;
+        
+        if ui.add_enabled(
+            can_test,
+            egui::Button::new(
+                egui::RichText::new(
+                    if connection_tab.is_testing_connection {
+                        "🔄 Testing..."
+                    } else {
+                        "🔍 Test"
+                    }
+                )
+                .size(13.0)
+                .color(egui::Color32::WHITE)
+            )
+            .fill(if can_test { 
+                egui::Color32::from_rgb(16, 124, 16) 
+            } else { 
+                ui.visuals().widgets.inactive.bg_fill 
+            })
+            .min_size(egui::vec2(80.0, 32.0))
+            .rounding(6.0)
+        ).on_hover_text("Test server connection").clicked() {
+            add_log_entry(operation_log, "🔍 Testing connection...".to_string());
+            connection_tab.start_test(settings, ctx);
+        }
+        
+        if ui.add_enabled(
+            can_sync,
+            egui::Button::new(
+                egui::RichText::new(
+                    if connection_tab.is_syncing {
+                        "🔄 Syncing..."
+                    } else {
+                        "🔄 Sync"
+                    }
+                )
+                .size(13.0)
+                .color(egui::Color32::WHITE)
+            )
+            .fill(if can_sync { 
+                egui::Color32::from_rgb(255, 140, 0) 
+            } else { 
+                ui.visuals().widgets.inactive.bg_fill 
+            })
+            .min_size(egui::vec2(80.0, 32.0))
+            .rounding(6.0)
+        ).on_hover_text("Synchronize SSH keys now").clicked() {
+            add_log_entry(operation_log, "🔄 Starting sync...".to_string());
+            connection_tab.start_sync(settings, ctx);
+        }
+    });
+}
+
+/// Add entry to operation log with timestamp
+pub fn add_log_entry(operation_log: &mut Vec<String>, message: String) {
+    let now = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap();
+    let secs = now.as_secs();
+    let millis = now.subsec_millis();
+    
+    // Format as HH:MM:SS.mmm
+    let hours = (secs / 3600) % 24;
+    let minutes = (secs / 60) % 60;
+    let seconds = secs % 60;
+    let timestamp = format!("{:02}:{:02}:{:02}.{:03}", hours, minutes, seconds, millis);
+    
+    let log_entry = format!("{} {}", timestamp, message);
+    
+    operation_log.push(log_entry);
+    
+    // Keep only last 20 entries to prevent memory growth
+    if operation_log.len() > 20 {
+        operation_log.remove(0);
+    }
+}

src/gui/settings/window.rs

@@ -0,0 +1,584 @@
+use eframe::egui;
+use log::info;
+use std::sync::mpsc;
+use crate::gui::common::{load_settings, KhmSettings};
+use crate::gui::admin::{AdminState, AdminOperation, render_statistics, render_search_controls, 
+                      render_bulk_actions, render_keys_table, KeyAction, BulkAction};
+use crate::gui::api::{SshKey, bulk_deprecate_servers, bulk_restore_servers, 
+                     deprecate_key, restore_key, delete_key};
+
+use super::connection::{ConnectionTab, SettingsTab};
+use super::ui::{render_connection_tab, add_log_entry};
+
+pub struct SettingsWindow {
+    settings: KhmSettings,
+    auto_sync_interval_str: String,
+    current_tab: SettingsTab,
+    connection_tab: ConnectionTab,
+    admin_state: AdminState,
+    admin_receiver: Option<mpsc::Receiver<Result<Vec<SshKey>, String>>>,
+    operation_receiver: Option<mpsc::Receiver<Result<String, String>>>,
+    operation_log: Vec<String>,
+}
+
+impl SettingsWindow {
+    pub fn new() -> Self {
+        let settings = load_settings();
+        let auto_sync_interval_str = settings.auto_sync_interval_minutes.to_string();
+        
+        Self {
+            settings,
+            auto_sync_interval_str,
+            current_tab: SettingsTab::Connection,
+            connection_tab: ConnectionTab::default(),
+            admin_state: AdminState::default(),
+            admin_receiver: None,
+            operation_receiver: None,
+            operation_log: Vec::new(),
+        }
+    }
+}
+
+impl eframe::App for SettingsWindow {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        // Check for admin operation results
+        self.check_admin_results(ctx);
+        
+        // Apply enhanced modern dark theme
+        apply_modern_theme(ctx);
+        
+        // Bottom panel for Activity Log (fixed at bottom)
+        egui::TopBottomPanel::bottom("activity_log_panel")
+            .resizable(false)
+            .min_height(140.0)
+            .max_height(140.0)
+            .frame(egui::Frame::none()
+                .fill(egui::Color32::from_gray(12))
+                .stroke(egui::Stroke::new(1.0, egui::Color32::from_gray(60)))
+            )
+            .show(ctx, |ui| {
+                render_bottom_activity_log(ui, &mut self.operation_log);
+            });
+        
+        egui::CentralPanel::default()
+            .frame(egui::Frame::none()
+                .fill(egui::Color32::from_gray(18))
+                .inner_margin(egui::Margin::same(20.0))
+            )
+            .show(ctx, |ui| {
+                // Modern header with gradient-like styling
+                let header_frame = egui::Frame::none()
+                    .fill(ui.visuals().panel_fill)
+                    .rounding(egui::Rounding::same(8.0))
+                    .inner_margin(egui::Margin::same(12.0))
+                    .stroke(egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color));
+                
+                header_frame.show(ui, |ui| {
+                    ui.horizontal(|ui| {
+                        ui.add_space(4.0);
+                        ui.label("🔑");
+                        ui.heading(egui::RichText::new("KHM Settings").size(20.0).strong());
+                        ui.label(egui::RichText::new(
+                            "(Known Hosts Manager for SSH key management and synchronization)"
+                        ).size(11.0).weak().italics());
+                        
+                        ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                            // Version from Cargo.toml
+                            let version = env!("CARGO_PKG_VERSION");
+                            if ui.small_button(format!("v{}", version))
+                                .on_hover_text(format!(
+                                    "{}\n{}\nRepository: {}\nLicense: {}", 
+                                    env!("CARGO_PKG_DESCRIPTION"),
+                                    env!("CARGO_PKG_AUTHORS"),
+                                    env!("CARGO_PKG_REPOSITORY"),
+                                    "WTFPL"
+                                ))
+                                .clicked() 
+                            {
+                                // Open repository URL
+                                if let Err(_) = std::process::Command::new("open")
+                                    .arg(env!("CARGO_PKG_REPOSITORY"))
+                                    .spawn() 
+                                {
+                                    // Fallback for non-macOS systems
+                                    let _ = std::process::Command::new("xdg-open")
+                                        .arg(env!("CARGO_PKG_REPOSITORY"))
+                                        .spawn();
+                                }
+                            }
+                        });
+                    });
+                });
+                
+                ui.add_space(12.0);
+                
+                // Modern tab selector with card styling
+                ui.horizontal(|ui| {
+                    ui.spacing_mut().item_spacing.x = 6.0;
+                    
+                    // Connection/Settings Tab
+                    let connection_selected = matches!(self.current_tab, SettingsTab::Connection);
+                    let connection_button = egui::Button::new(
+                        egui::RichText::new("🌐 Connection").size(13.0)
+                    )
+                    .fill(if connection_selected { 
+                        egui::Color32::from_rgb(0, 120, 212)
+                    } else {
+                        ui.visuals().widgets.inactive.bg_fill
+                    })
+                    .stroke(if connection_selected {
+                        egui::Stroke::new(1.0, egui::Color32::from_rgb(0, 120, 212))
+                    } else {
+                        egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color)
+                    })
+                    .rounding(6.0)
+                    .min_size(egui::vec2(110.0, 32.0));
+                    
+                    if ui.add(connection_button).clicked() {
+                        self.current_tab = SettingsTab::Connection;
+                    }
+                    
+                    // Admin Tab
+                    let admin_selected = matches!(self.current_tab, SettingsTab::Admin);
+                    let admin_button = egui::Button::new(
+                        egui::RichText::new("🔧 Admin Panel").size(13.0)
+                    )
+                    .fill(if admin_selected { 
+                        egui::Color32::from_rgb(120, 80, 0)
+                    } else {
+                        ui.visuals().widgets.inactive.bg_fill
+                    })
+                    .stroke(if admin_selected {
+                        egui::Stroke::new(1.0, egui::Color32::from_rgb(120, 80, 0))
+                    } else {
+                        egui::Stroke::new(1.0, ui.visuals().widgets.noninteractive.bg_stroke.color)
+                    })
+                    .rounding(6.0)
+                    .min_size(egui::vec2(110.0, 32.0));
+                    
+                    if ui.add(admin_button).clicked() {
+                        self.current_tab = SettingsTab::Admin;
+                    }
+                });
+                
+                ui.add_space(16.0);
+                
+                // Content area with proper spacing
+                match self.current_tab {
+                    SettingsTab::Connection => {
+                        render_connection_tab(
+                            ui, 
+                            ctx, 
+                            &mut self.settings, 
+                            &mut self.auto_sync_interval_str,
+                            &mut self.connection_tab,
+                            &mut self.operation_log
+                        );
+                    }
+                    SettingsTab::Admin => {
+                        self.render_admin_tab(ui, ctx);
+                    }
+                }
+            });
+    }
+}
+
+impl SettingsWindow {
+    fn check_admin_results(&mut self, ctx: &egui::Context) {
+        // Check for admin keys loading result
+        if let Some(receiver) = &self.admin_receiver {
+            if let Ok(result) = receiver.try_recv() {
+                self.admin_state.handle_keys_loaded(result);
+                self.admin_receiver = None;
+                ctx.request_repaint();
+            }
+        }
+        
+        // Check for operation results
+        if let Some(receiver) = &self.operation_receiver {
+            if let Ok(result) = receiver.try_recv() {
+                match result {
+                    Ok(message) => {
+                        info!("Operation completed: {}", message);
+                        add_log_entry(&mut self.operation_log, format!("✅ {}", message));
+                        // Reload keys after operation
+                        self.load_admin_keys(ctx);
+                    }
+                    Err(error) => {
+                        add_log_entry(&mut self.operation_log, format!("❌ Operation failed: {}", error));
+                    }
+                }
+                self.admin_state.current_operation = AdminOperation::None;
+                self.operation_receiver = None;
+                ctx.request_repaint();
+            }
+        }
+    }
+    
+    fn render_admin_tab(&mut self, ui: &mut egui::Ui, ctx: &egui::Context) {
+        // Admin tab header
+        ui.horizontal(|ui| {
+            ui.label(egui::RichText::new("🔧 Admin Panel").size(18.0).strong());
+            
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                if ui.button("🔁 Refresh").clicked() {
+                    self.load_admin_keys(ctx);
+                }
+                
+                if let Some(last_load) = self.admin_state.last_load_time {
+                    let elapsed = last_load.elapsed().as_secs();
+                    ui.label(format!("Updated {}s ago", elapsed));
+                }
+            });
+        });
+        
+        ui.separator();
+        ui.add_space(10.0);
+        
+        // Check if connection is configured
+        if self.settings.host.is_empty() || self.settings.flow.is_empty() {
+            ui.vertical_centered(|ui| {
+                ui.label(egui::RichText::new("❗ Please configure connection settings first")
+                    .size(16.0)
+                    .color(egui::Color32::YELLOW));
+                ui.add_space(10.0);
+                if ui.button("Go to Connection Settings").clicked() {
+                    self.current_tab = SettingsTab::Connection;
+                }
+            });
+            return;
+        }
+        
+        // Load keys automatically on first view
+        if self.admin_state.keys.is_empty() && !matches!(self.admin_state.current_operation, AdminOperation::LoadingKeys) {
+            self.load_admin_keys(ctx);
+        }
+        
+        // Show loading state
+        if matches!(self.admin_state.current_operation, AdminOperation::LoadingKeys) {
+            ui.vertical_centered(|ui| {
+                ui.spinner();
+                ui.label("Loading keys...");
+            });
+            return;
+        }
+        
+        // Statistics section
+        render_statistics(ui, &self.admin_state);
+        ui.add_space(10.0);
+        
+        // Search and filters
+        render_search_controls(ui, &mut self.admin_state);
+        ui.add_space(10.0);
+        
+        // Bulk actions
+        let bulk_action = render_bulk_actions(ui, &mut self.admin_state);
+        self.handle_bulk_action(bulk_action, ctx);
+        
+        if self.admin_state.selected_servers.values().any(|&v| v) {
+            ui.add_space(8.0);
+        }
+        
+        // Keys table
+        egui::ScrollArea::vertical()
+            .max_height(450.0)
+            .auto_shrink([false; 2])
+            .show(ui, |ui| {
+                let key_action = render_keys_table(ui, &mut self.admin_state);
+                self.handle_key_action(key_action, ctx);
+            });
+    }
+    
+    fn load_admin_keys(&mut self, ctx: &egui::Context) {
+        if let Some(receiver) = self.admin_state.load_keys(&self.settings, ctx) {
+            self.admin_receiver = Some(receiver);
+        }
+    }
+    
+    fn handle_bulk_action(&mut self, action: BulkAction, ctx: &egui::Context) {
+        match action {
+            BulkAction::DeprecateSelected => {
+                let selected = self.admin_state.get_selected_servers();
+                if !selected.is_empty() {
+                    self.start_bulk_deprecate(selected, ctx);
+                }
+            }
+            BulkAction::RestoreSelected => {
+                let selected = self.admin_state.get_selected_servers();
+                if !selected.is_empty() {
+                    self.start_bulk_restore(selected, ctx);
+                }
+            }
+            BulkAction::ClearSelection => {
+                // Selection already cleared in UI
+            }
+            BulkAction::None => {}
+        }
+    }
+    
+    fn handle_key_action(&mut self, action: KeyAction, ctx: &egui::Context) {
+        match action {
+            KeyAction::DeprecateKey(server) | KeyAction::DeprecateServer(server) => {
+                self.start_deprecate_key(&server, ctx);
+            }
+            KeyAction::RestoreKey(server) | KeyAction::RestoreServer(server) => {
+                self.start_restore_key(&server, ctx);
+            }
+            KeyAction::DeleteKey(server) => {
+                self.start_delete_key(&server, ctx);
+            }
+            KeyAction::None => {}
+        }
+    }
+    
+    fn start_bulk_deprecate(&mut self, servers: Vec<String>, ctx: &egui::Context) {
+        self.admin_state.current_operation = AdminOperation::BulkDeprecating;
+        add_log_entry(&mut self.operation_log, format!("Deprecating {} servers...", servers.len()));
+        
+        let (tx, rx) = mpsc::channel();
+        self.operation_receiver = Some(rx);
+        
+        let host = self.settings.host.clone();
+        let flow = self.settings.flow.clone();
+        let basic_auth = self.settings.basic_auth.clone();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                bulk_deprecate_servers(host, flow, basic_auth, servers).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+    
+    fn start_bulk_restore(&mut self, servers: Vec<String>, ctx: &egui::Context) {
+        self.admin_state.current_operation = AdminOperation::BulkRestoring;
+        add_log_entry(&mut self.operation_log, format!("Restoring {} servers...", servers.len()));
+        
+        let (tx, rx) = mpsc::channel();
+        self.operation_receiver = Some(rx);
+        
+        let host = self.settings.host.clone();
+        let flow = self.settings.flow.clone();
+        let basic_auth = self.settings.basic_auth.clone();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                bulk_restore_servers(host, flow, basic_auth, servers).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+    
+    fn start_deprecate_key(&mut self, server: &str, ctx: &egui::Context) {
+        self.admin_state.current_operation = AdminOperation::DeprecatingKey;
+        add_log_entry(&mut self.operation_log, format!("Deprecating key for server: {}", server));
+        
+        let (tx, rx) = mpsc::channel();
+        self.operation_receiver = Some(rx);
+        
+        let host = self.settings.host.clone();
+        let flow = self.settings.flow.clone();
+        let basic_auth = self.settings.basic_auth.clone();
+        let server_name = server.to_string();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                deprecate_key(host, flow, basic_auth, server_name).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+    
+    fn start_restore_key(&mut self, server: &str, ctx: &egui::Context) {
+        self.admin_state.current_operation = AdminOperation::RestoringKey;
+        add_log_entry(&mut self.operation_log, format!("Restoring key for server: {}", server));
+        
+        let (tx, rx) = mpsc::channel();
+        self.operation_receiver = Some(rx);
+        
+        let host = self.settings.host.clone();
+        let flow = self.settings.flow.clone();
+        let basic_auth = self.settings.basic_auth.clone();
+        let server_name = server.to_string();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                restore_key(host, flow, basic_auth, server_name).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+    
+    fn start_delete_key(&mut self, server: &str, ctx: &egui::Context) {
+        self.admin_state.current_operation = AdminOperation::DeletingKey;
+        add_log_entry(&mut self.operation_log, format!("Deleting key for server: {}", server));
+        
+        let (tx, rx) = mpsc::channel();
+        self.operation_receiver = Some(rx);
+        
+        let host = self.settings.host.clone();
+        let flow = self.settings.flow.clone();
+        let basic_auth = self.settings.basic_auth.clone();
+        let server_name = server.to_string();
+        let ctx_clone = ctx.clone();
+        
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            let result = rt.block_on(async {
+                delete_key(host, flow, basic_auth, server_name).await
+            });
+            
+            let _ = tx.send(result);
+            ctx_clone.request_repaint();
+        });
+    }
+}
+
+/// Apply modern dark theme for the settings window with enhanced styling
+fn apply_modern_theme(ctx: &egui::Context) {
+    let mut visuals = egui::Visuals::dark();
+    
+    // Modern color palette
+    visuals.window_fill = egui::Color32::from_gray(18);  // Darker background
+    visuals.panel_fill = egui::Color32::from_gray(24);   // Panel background
+    visuals.faint_bg_color = egui::Color32::from_gray(32); // Card background
+    visuals.extreme_bg_color = egui::Color32::from_gray(12); // Darkest areas
+    
+    // Enhanced widget styling
+    visuals.button_frame = true;
+    visuals.collapsing_header_frame = true;
+    visuals.indent_has_left_vline = true;
+    visuals.striped = true;
+    
+    // Modern rounded corners
+    let rounding = egui::Rounding::same(8.0);
+    visuals.menu_rounding = rounding;
+    visuals.window_rounding = egui::Rounding::same(16.0);
+    visuals.widgets.noninteractive.rounding = rounding;
+    visuals.widgets.inactive.rounding = rounding;
+    visuals.widgets.hovered.rounding = rounding;
+    visuals.widgets.active.rounding = rounding;
+    
+    // Better widget colors
+    visuals.widgets.noninteractive.bg_fill = egui::Color32::from_gray(40);
+    visuals.widgets.inactive.bg_fill = egui::Color32::from_gray(45);
+    visuals.widgets.hovered.bg_fill = egui::Color32::from_gray(55);
+    visuals.widgets.active.bg_fill = egui::Color32::from_gray(60);
+    
+    // Subtle borders
+    let border_color = egui::Color32::from_gray(60);
+    visuals.widgets.noninteractive.bg_stroke = egui::Stroke::new(1.0, border_color);
+    visuals.widgets.inactive.bg_stroke = egui::Stroke::new(1.0, border_color);
+    visuals.widgets.hovered.bg_stroke = egui::Stroke::new(1.5, egui::Color32::from_gray(80));
+    visuals.widgets.active.bg_stroke = egui::Stroke::new(1.5, egui::Color32::from_gray(100));
+    
+    ctx.set_visuals(visuals);
+}
+
+/// Render bottom activity log panel
+fn render_bottom_activity_log(ui: &mut egui::Ui, operation_log: &mut Vec<String>) {
+    ui.add_space(18.0); // Larger top padding
+    
+    ui.horizontal(|ui| {
+        ui.add_space(8.0);
+        ui.label("📋");
+        ui.label(egui::RichText::new("Activity Log").size(13.0).strong());
+        
+        ui.with_layout(egui::Layout::right_to_left(egui::Align::Min), |ui| {
+            ui.add_space(8.0);
+            if ui.small_button("🗑 Clear").clicked() {
+                operation_log.clear();
+            }
+        });
+    });
+    
+    ui.add_space(8.0);
+    
+    // Add horizontal margin for the text area
+    ui.horizontal(|ui| {
+        ui.add_space(8.0); // Left margin
+        
+        // Show last 5 log entries in multiline text
+        let log_text = if operation_log.is_empty() {
+            "No recent activity".to_string()
+        } else {
+            let start_idx = if operation_log.len() > 5 {
+                operation_log.len() - 5
+            } else {
+                0
+            };
+            operation_log[start_idx..].join("\n")
+        };
+        
+        ui.add_sized(
+            [ui.available_width() - 8.0, 80.0], // Account for right margin
+            egui::TextEdit::multiline(&mut log_text.clone())
+                .font(egui::FontId::new(11.0, egui::FontFamily::Monospace))
+                .interactive(false)
+        );
+        
+        ui.add_space(8.0); // Right margin
+    });
+}
+
+/// Create window icon for settings window
+pub fn create_window_icon() -> egui::IconData {
+    // Create a simple programmatic icon (blue square with white border)
+    let icon_size = 32;
+    let icon_data: Vec<u8> = (0..icon_size * icon_size)
+        .flat_map(|i| {
+            let y = i / icon_size;
+            let x = i % icon_size;
+            if x < 2 || x >= 30 || y < 2 || y >= 30 {
+                [255, 255, 255, 255] // White border
+            } else {
+                [64, 128, 255, 255] // Blue center
+            }
+        })
+        .collect();
+    
+    egui::IconData {
+        rgba: icon_data,
+        width: icon_size as u32,
+        height: icon_size as u32,
+    }
+}
+
+/// Run the settings window application with modern horizontal styling
+pub fn run_settings_window() {
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default()
+            .with_title("KHM Settings")
+            .with_inner_size([900.0, 905.0])  // Decreased height by another 15px
+            .with_min_inner_size([900.0, 905.0])  // Fixed size
+            .with_max_inner_size([900.0, 905.0]) // Same as min - fixed size
+            .with_resizable(false) // Disable resizing since window is fixed size
+            .with_icon(create_window_icon())
+            .with_decorations(true)
+            .with_transparent(false),
+        centered: true,
+        ..Default::default()
+    };
+    
+    let _ = eframe::run_native(
+        "KHM Settings",
+        options,
+        Box::new(|_cc| Ok(Box::new(SettingsWindow::new()))),
+    );
+}

src/gui/tray/app.rs

@@ -0,0 +1,275 @@
+use log::{error, info};
+
+#[cfg(feature = "gui")]
+use notify::RecursiveMode;
+#[cfg(feature = "gui")]
+use notify_debouncer_mini::{new_debouncer, DebounceEventResult};
+use std::sync::{Arc, Mutex};
+use std::time::Duration;
+use tray_icon::{
+    menu::MenuEvent,
+    TrayIcon,
+};
+use winit::{
+    application::ApplicationHandler,
+    event_loop::{EventLoop, EventLoopProxy},
+};
+
+#[cfg(target_os = "macos")]
+use winit::platform::macos::EventLoopBuilderExtMacOS;
+
+use super::{SyncStatus, TrayMenuIds, create_tray_icon, update_tray_menu, 
+             create_tooltip, start_auto_sync_task, update_sync_status};
+use crate::gui::common::{load_settings, get_config_path, perform_sync, KhmSettings};
+
+pub struct TrayApplication {
+    tray_icon: Option<TrayIcon>,
+    menu_ids: Option<TrayMenuIds>,
+    settings: Arc<Mutex<KhmSettings>>,
+    sync_status: Arc<Mutex<SyncStatus>>,
+    #[cfg(feature = "gui")]
+    _debouncer: Option<notify_debouncer_mini::Debouncer<notify::RecommendedWatcher>>,
+    proxy: EventLoopProxy<crate::gui::UserEvent>,
+    auto_sync_handle: Option<std::thread::JoinHandle<()>>,
+}
+
+impl TrayApplication {
+    pub fn new(proxy: EventLoopProxy<crate::gui::UserEvent>) -> Self {
+        Self {
+            tray_icon: None,
+            menu_ids: None,
+            settings: Arc::new(Mutex::new(load_settings())),
+            sync_status: Arc::new(Mutex::new(SyncStatus::default())),
+            #[cfg(feature = "gui")]
+            _debouncer: None,
+            proxy,
+            auto_sync_handle: None,
+        }
+    }
+    
+    #[cfg(feature = "gui")]
+    fn setup_file_watcher(&mut self) {
+        let config_path = get_config_path();
+        let (tx, rx) = std::sync::mpsc::channel::<DebounceEventResult>();
+        let proxy = self.proxy.clone();
+        
+        std::thread::spawn(move || {
+            while let Ok(result) = rx.recv() {
+                if let Ok(events) = result {
+                    if events.iter().any(|e| e.path.to_string_lossy().contains("khm_config.json")) {
+                        let _ = proxy.send_event(crate::gui::UserEvent::ConfigFileChanged);
+                    }
+                }
+            }
+        });
+        
+        if let Ok(mut debouncer) = new_debouncer(Duration::from_millis(500), tx) {
+            if let Some(config_dir) = config_path.parent() {
+                if debouncer.watcher().watch(config_dir, RecursiveMode::NonRecursive).is_ok() {
+                    info!("File watcher started");
+                    self._debouncer = Some(debouncer);
+                } else {
+                    error!("Failed to start file watcher");
+                }
+            }
+        }
+    }
+    
+    fn handle_config_change(&mut self) {
+        info!("Config file changed");
+        let new_settings = load_settings();
+        let old_interval = self.settings.lock().unwrap().auto_sync_interval_minutes;
+        let new_interval = new_settings.auto_sync_interval_minutes;
+        
+        *self.settings.lock().unwrap() = new_settings;
+        
+        // Update menu
+        if let Some(tray_icon) = &self.tray_icon {
+            let settings = self.settings.lock().unwrap();
+            let new_menu_ids = update_tray_menu(tray_icon, &settings);
+            self.menu_ids = Some(new_menu_ids);
+        }
+        
+        // Update tooltip
+        self.update_tooltip();
+        
+        // Restart auto sync if interval changed
+        if old_interval != new_interval {
+            info!("Auto sync interval changed from {} to {} minutes, restarting auto sync", old_interval, new_interval);
+            self.start_auto_sync();
+        }
+    }
+    
+    fn start_auto_sync(&mut self) {
+        if let Some(handle) = self.auto_sync_handle.take() {
+            // Note: In a real implementation, you'd want to properly signal the thread to stop
+            drop(handle);
+        }
+        
+        self.auto_sync_handle = start_auto_sync_task(
+            Arc::clone(&self.settings),
+            Arc::clone(&self.sync_status),
+            self.proxy.clone()
+        );
+    }
+    
+    fn update_tooltip(&self) {
+        if let Some(tray_icon) = &self.tray_icon {
+            let settings = self.settings.lock().unwrap();
+            let sync_status = self.sync_status.lock().unwrap();
+            let tooltip = create_tooltip(&settings, &sync_status);
+            let _ = tray_icon.set_tooltip(Some(&tooltip));
+        }
+    }
+    
+    fn handle_menu_event(&mut self, event: MenuEvent, event_loop: &winit::event_loop::ActiveEventLoop) {
+        if let Some(menu_ids) = &self.menu_ids {
+            if event.id == menu_ids.settings_id {
+                info!("Settings menu clicked");
+                self.launch_settings_window();
+            } else if event.id == menu_ids.quit_id {
+                info!("Quitting KHM application");
+                event_loop.exit();
+            } else if event.id == menu_ids.sync_id {
+                info!("Starting manual sync operation");
+                self.start_manual_sync();
+            }
+        }
+    }
+    
+    fn launch_settings_window(&self) {
+        if let Ok(exe_path) = std::env::current_exe() {
+            std::thread::spawn(move || {
+                if let Err(e) = std::process::Command::new(&exe_path)
+                    .arg("--gui")
+                    .arg("--settings-ui")
+                    .spawn()
+                {
+                    error!("Failed to launch settings window: {}", e);
+                }
+            });
+        }
+    }
+    
+    fn start_manual_sync(&self) {
+        let settings = self.settings.lock().unwrap().clone();
+        let sync_status_clone: Arc<Mutex<SyncStatus>> = Arc::clone(&self.sync_status);
+        let proxy_clone = self.proxy.clone();
+        
+        // Check if settings are valid
+        if settings.host.is_empty() || settings.flow.is_empty() {
+            error!("Cannot sync: host or flow not configured");
+            return;
+        }
+        
+        info!("Syncing with host: {}, flow: {}", settings.host, settings.flow);
+        
+        // Run sync in separate thread with its own tokio runtime
+        std::thread::spawn(move || {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            rt.block_on(async {
+                match perform_sync(&settings).await {
+                    Ok(keys_count) => {
+                        info!("Sync completed successfully with {} keys", keys_count);
+                        let mut status = sync_status_clone.lock().unwrap();
+                        status.last_sync_time = Some(std::time::Instant::now());
+                        status.last_sync_keys = Some(keys_count);
+                        let _ = proxy_clone.send_event(crate::gui::UserEvent::UpdateMenu);
+                    }
+                    Err(e) => {
+                        error!("Sync failed: {}", e);
+                    }
+                }
+            });
+        });
+    }
+    
+    fn handle_update_menu(&mut self) {
+        let settings = self.settings.lock().unwrap();
+        if !settings.host.is_empty() && !settings.flow.is_empty() && settings.in_place {
+            let mut sync_status = self.sync_status.lock().unwrap();
+            update_sync_status(&settings, &mut sync_status);
+        }
+        drop(settings);
+        
+        self.update_tooltip();
+    }
+}
+
+impl ApplicationHandler<crate::gui::UserEvent> for TrayApplication {
+    fn window_event(
+        &mut self,
+        _event_loop: &winit::event_loop::ActiveEventLoop,
+        _window_id: winit::window::WindowId,
+        _event: winit::event::WindowEvent,
+    ) {}
+    
+    fn resumed(&mut self, _event_loop: &winit::event_loop::ActiveEventLoop) {
+        if self.tray_icon.is_none() {
+            info!("Creating tray icon");
+            let settings = self.settings.lock().unwrap();
+            let sync_status = self.sync_status.lock().unwrap();
+            let (tray_icon, menu_ids) = create_tray_icon(&settings, &sync_status);
+            drop(settings);
+            drop(sync_status);
+            
+            self.tray_icon = Some(tray_icon);
+            self.menu_ids = Some(menu_ids);
+            
+            self.setup_file_watcher();
+            self.start_auto_sync();
+            info!("KHM tray application ready");
+        }
+    }
+    
+    fn user_event(&mut self, event_loop: &winit::event_loop::ActiveEventLoop, event: crate::gui::UserEvent) {
+        match event {
+            crate::gui::UserEvent::TrayIconEvent => {}
+            crate::gui::UserEvent::UpdateMenu => {
+                self.handle_update_menu();
+            }
+            crate::gui::UserEvent::MenuEvent(event) => {
+                self.handle_menu_event(event, event_loop);
+            }
+            crate::gui::UserEvent::ConfigFileChanged => {
+                self.handle_config_change();
+            }
+        }
+    }
+}
+
+/// Run tray application
+pub async fn run_tray_app() -> std::io::Result<()> {
+    #[cfg(target_os = "macos")]
+    let event_loop = {
+        use winit::platform::macos::ActivationPolicy;
+        EventLoop::<crate::gui::UserEvent>::with_user_event()
+            .with_activation_policy(ActivationPolicy::Accessory)
+            .build()
+            .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, format!("Failed to create event loop: {}", e)))?
+    };
+    
+    #[cfg(not(target_os = "macos"))]
+    let event_loop = EventLoop::<crate::gui::UserEvent>::with_user_event().build()
+        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, format!("Failed to create event loop: {}", e)))?;
+    
+    let proxy = event_loop.create_proxy();
+    
+    // Setup event handlers
+    let proxy_clone = proxy.clone();
+    tray_icon::TrayIconEvent::set_event_handler(Some(move |_event| {
+        let _ = proxy_clone.send_event(crate::gui::UserEvent::TrayIconEvent);
+    }));
+    
+    let proxy_clone = proxy.clone();
+    MenuEvent::set_event_handler(Some(move |event: MenuEvent| {
+        let _ = proxy_clone.send_event(crate::gui::UserEvent::MenuEvent(event));
+    }));
+    
+    let mut app = TrayApplication::new(proxy);
+    
+    event_loop.run_app(&mut app)
+        .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, format!("Event loop error: {:?}", e)))?;
+    
+    Ok(())
+}

src/gui/tray/icon.rs

@@ -0,0 +1,281 @@
+use log::{error, info};
+use std::sync::{Arc, Mutex};
+use tray_icon::{
+    menu::{Menu, MenuItem, MenuId},
+    TrayIcon, TrayIconBuilder,
+};
+use crate::gui::common::{KhmSettings, perform_sync};
+
+#[derive(Debug, Clone)]
+pub struct SyncStatus {
+    pub last_sync_time: Option<std::time::Instant>,
+    pub last_sync_keys: Option<usize>,
+    pub next_sync_in_seconds: Option<u64>,
+}
+
+impl Default for SyncStatus {
+    fn default() -> Self {
+        Self {
+            last_sync_time: None,
+            last_sync_keys: None,
+            next_sync_in_seconds: None,
+        }
+    }
+}
+
+pub struct TrayMenuIds {
+    pub settings_id: MenuId,
+    pub quit_id: MenuId,
+    pub sync_id: MenuId,
+}
+
+/// Create tray icon with menu
+pub fn create_tray_icon(settings: &KhmSettings, sync_status: &SyncStatus) -> (TrayIcon, TrayMenuIds) {
+    // Create simple blue icon
+    let icon_data: Vec<u8> = (0..32*32).flat_map(|i| {
+        let y = i / 32;
+        let x = i % 32;
+        if x < 2 || x >= 30 || y < 2 || y >= 30 {
+            [255, 255, 255, 255] // White border
+        } else {
+            [64, 128, 255, 255] // Blue center
+        }
+    }).collect();
+    
+    let icon = tray_icon::Icon::from_rgba(icon_data, 32, 32).unwrap();
+    let menu = Menu::new();
+    
+    // Show current configuration status (static)
+    let host_text = if settings.host.is_empty() {
+        "Host: Not configured"
+    } else {
+        &format!("Host: {}", settings.host)
+    };
+    menu.append(&MenuItem::new(host_text, false, None)).unwrap();
+    
+    let flow_text = if settings.flow.is_empty() {
+        "Flow: Not configured"
+    } else {
+        &format!("Flow: {}", settings.flow)
+    };
+    menu.append(&MenuItem::new(flow_text, false, None)).unwrap();
+    
+    let is_auto_sync_enabled = !settings.host.is_empty() && !settings.flow.is_empty() && settings.in_place;
+    let sync_text = format!("Auto sync: {} ({}min)", 
+                           if is_auto_sync_enabled { "On" } else { "Off" },
+                           settings.auto_sync_interval_minutes);
+    menu.append(&MenuItem::new(&sync_text, false, None)).unwrap();
+    
+    menu.append(&tray_icon::menu::PredefinedMenuItem::separator()).unwrap();
+    
+    // Sync Now menu item
+    let sync_item = MenuItem::new("Sync Now", !settings.host.is_empty() && !settings.flow.is_empty(), None);
+    let sync_id = sync_item.id().clone();
+    menu.append(&sync_item).unwrap();
+    
+    menu.append(&tray_icon::menu::PredefinedMenuItem::separator()).unwrap();
+    
+    // Settings menu item
+    let settings_item = MenuItem::new("Settings", true, None);
+    let settings_id = settings_item.id().clone();
+    menu.append(&settings_item).unwrap();
+    
+    menu.append(&tray_icon::menu::PredefinedMenuItem::separator()).unwrap();
+    
+    // Quit menu item
+    let quit_item = MenuItem::new("Quit", true, None);
+    let quit_id = quit_item.id().clone();
+    menu.append(&quit_item).unwrap();
+    
+    // Create initial tooltip
+    let tooltip = create_tooltip(settings, sync_status);
+    
+    let tray_icon = TrayIconBuilder::new()
+        .with_tooltip(&tooltip)
+        .with_icon(icon)
+        .with_menu(Box::new(menu))
+        .build()
+        .unwrap();
+    
+    let menu_ids = TrayMenuIds {
+        settings_id,
+        quit_id,
+        sync_id,
+    };
+    
+    (tray_icon, menu_ids)
+}
+
+/// Update tray menu with new settings
+pub fn update_tray_menu(tray_icon: &TrayIcon, settings: &KhmSettings) -> TrayMenuIds {
+    let menu = Menu::new();
+    
+    // Show current configuration status (static)
+    let host_text = if settings.host.is_empty() {
+        "Host: Not configured"
+    } else {
+        &format!("Host: {}", settings.host)
+    };
+    menu.append(&MenuItem::new(host_text, false, None)).unwrap();
+    
+    let flow_text = if settings.flow.is_empty() {
+        "Flow: Not configured"
+    } else {
+        &format!("Flow: {}", settings.flow)
+    };
+    menu.append(&MenuItem::new(flow_text, false, None)).unwrap();
+    
+    let is_auto_sync_enabled = !settings.host.is_empty() && !settings.flow.is_empty() && settings.in_place;
+    let sync_text = format!("Auto sync: {} ({}min)", 
+                           if is_auto_sync_enabled { "On" } else { "Off" },
+                           settings.auto_sync_interval_minutes);
+    menu.append(&MenuItem::new(&sync_text, false, None)).unwrap();
+    
+    menu.append(&tray_icon::menu::PredefinedMenuItem::separator()).unwrap();
+    
+    // Sync Now menu item
+    let sync_item = MenuItem::new("Sync Now", !settings.host.is_empty() && !settings.flow.is_empty(), None);
+    let sync_id = sync_item.id().clone();
+    menu.append(&sync_item).unwrap();
+    
+    menu.append(&tray_icon::menu::PredefinedMenuItem::separator()).unwrap();
+    
+    // Settings menu item
+    let settings_item = MenuItem::new("Settings", true, None);
+    let settings_id = settings_item.id().clone();
+    menu.append(&settings_item).unwrap();
+    
+    menu.append(&tray_icon::menu::PredefinedMenuItem::separator()).unwrap();
+    
+    // Quit menu item
+    let quit_item = MenuItem::new("Quit", true, None);
+    let quit_id = quit_item.id().clone();
+    menu.append(&quit_item).unwrap();
+    
+    tray_icon.set_menu(Some(Box::new(menu)));
+    
+    TrayMenuIds {
+        settings_id,
+        quit_id,
+        sync_id,
+    }
+}
+
+/// Create tooltip text for tray icon
+pub fn create_tooltip(settings: &KhmSettings, sync_status: &SyncStatus) -> String {
+    let mut tooltip = format!("KHM - SSH Key Manager\nHost: {}\nFlow: {}", settings.host, settings.flow);
+    
+    if let Some(keys_count) = sync_status.last_sync_keys {
+        tooltip.push_str(&format!("\nLast sync: {} keys", keys_count));
+    } else {
+        tooltip.push_str("\nLast sync: Never");
+    }
+    
+    if let Some(seconds) = sync_status.next_sync_in_seconds {
+        if seconds > 60 {
+            tooltip.push_str(&format!("\nNext sync: {}m {}s", seconds / 60, seconds % 60));
+        } else {
+            tooltip.push_str(&format!("\nNext sync: {}s", seconds));
+        }
+    }
+    
+    tooltip
+}
+
+/// Start auto sync background task
+pub fn start_auto_sync_task(
+    settings: Arc<Mutex<KhmSettings>>,
+    sync_status: Arc<Mutex<SyncStatus>>,
+    event_sender: winit::event_loop::EventLoopProxy<crate::gui::UserEvent>
+) -> Option<std::thread::JoinHandle<()>> {
+    let initial_settings = settings.lock().unwrap().clone();
+    
+    // Only start auto sync if settings are valid and in_place is enabled
+    if initial_settings.host.is_empty() || initial_settings.flow.is_empty() || !initial_settings.in_place {
+        info!("Auto sync disabled or settings invalid");
+        return None;
+    }
+    
+    info!("Starting auto sync with interval {} minutes", initial_settings.auto_sync_interval_minutes);
+    
+    let handle = std::thread::spawn(move || {
+        // Initial sync on startup
+        info!("Performing initial sync on startup");
+        let current_settings = settings.lock().unwrap().clone();
+        if !current_settings.host.is_empty() && !current_settings.flow.is_empty() {
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            rt.block_on(async {
+                match perform_sync(&current_settings).await {
+                    Ok(keys_count) => {
+                        info!("Initial sync completed successfully with {} keys", keys_count);
+                        let mut status = sync_status.lock().unwrap();
+                        status.last_sync_time = Some(std::time::Instant::now());
+                        status.last_sync_keys = Some(keys_count);
+                        let _ = event_sender.send_event(crate::gui::UserEvent::UpdateMenu);
+                    }
+                    Err(e) => {
+                        error!("Initial sync failed: {}", e);
+                    }
+                }
+            });
+        }
+        
+        // Start menu update timer
+        let timer_sender = event_sender.clone();
+        std::thread::spawn(move || {
+            loop {
+                std::thread::sleep(std::time::Duration::from_secs(1));
+                let _ = timer_sender.send_event(crate::gui::UserEvent::UpdateMenu);
+            }
+        });
+        
+        // Periodic sync
+        loop {
+            let interval_minutes = current_settings.auto_sync_interval_minutes;
+            std::thread::sleep(std::time::Duration::from_secs(interval_minutes as u64 * 60));
+            
+            let current_settings = settings.lock().unwrap().clone();
+            if current_settings.host.is_empty() || current_settings.flow.is_empty() || !current_settings.in_place {
+                info!("Auto sync stopped due to invalid settings or disabled in_place");
+                break;
+            }
+            
+            info!("Performing scheduled auto sync");
+            let rt = tokio::runtime::Runtime::new().unwrap();
+            rt.block_on(async {
+                match perform_sync(&current_settings).await {
+                    Ok(keys_count) => {
+                        info!("Auto sync completed successfully with {} keys", keys_count);
+                        let mut status = sync_status.lock().unwrap();
+                        status.last_sync_time = Some(std::time::Instant::now());
+                        status.last_sync_keys = Some(keys_count);
+                        let _ = event_sender.send_event(crate::gui::UserEvent::UpdateMenu);
+                    }
+                    Err(e) => {
+                        error!("Auto sync failed: {}", e);
+                    }
+                }
+            });
+        }
+    });
+    
+    Some(handle)
+}
+
+/// Update sync status for tooltip
+pub fn update_sync_status(settings: &KhmSettings, sync_status: &mut SyncStatus) {
+    if !settings.host.is_empty() && !settings.flow.is_empty() && settings.in_place {
+        if let Some(last_sync) = sync_status.last_sync_time {
+            let elapsed = last_sync.elapsed().as_secs();
+            let interval_seconds = settings.auto_sync_interval_minutes as u64 * 60;
+            
+            if elapsed < interval_seconds {
+                sync_status.next_sync_in_seconds = Some(interval_seconds - elapsed);
+            } else {
+                sync_status.next_sync_in_seconds = Some(0);
+            }
+        } else {
+            sync_status.next_sync_in_seconds = None;
+        }
+    }
+}

src/gui/tray/mod.rs

@@ -0,0 +1,6 @@
+mod app;
+mod icon;
+
+pub use app::*;
+pub use icon::{SyncStatus, TrayMenuIds, create_tray_icon, update_tray_menu, 
+               create_tooltip, start_auto_sync_task, update_sync_status};

src/main.rs

@@ -2,6 +2,7 @@ mod client;
 mod db;
 mod server;
 mod web;
+mod gui;
 
 use clap::Parser;
 use env_logger;
@@ -10,7 +11,7 @@ use log::{error, info};
 /// This application manages SSH keys and flows, either as a server or client.
 /// In server mode, it stores keys and flows in a PostgreSQL database.
 /// In client mode, it sends keys to the server and can update the known_hosts file with keys from the server.
-#[derive(Parser, Debug)]
+#[derive(Parser, Debug, Clone)]
 #[command(
     author = env!("CARGO_PKG_AUTHORS"),
     version = env!("CARGO_PKG_VERSION"),
@@ -26,21 +27,29 @@ use log::{error, info};
     \n\
     "
 )]
-struct Args {
+pub struct Args {
     /// Run in server mode (default: false)
     #[arg(long, help = "Run in server mode")]
-    server: bool,
+    pub server: bool,
+
+    /// Run with GUI tray interface (default: false)
+    #[arg(long, help = "Run with GUI tray interface")]
+    pub gui: bool,
+
+    /// Run settings UI window (used with --gui)
+    #[arg(long, help = "Run settings UI window (used with --gui)")]
+    pub settings_ui: bool,
 
     /// Update the known_hosts file with keys from the server after sending keys (default: false)
     #[arg(
         long,
         help = "Server mode: Sync the known_hosts file with keys from the server"
     )]
-    in_place: bool,
+    pub in_place: bool,
 
     /// Comma-separated list of flows to manage (default: default)
     #[arg(long, default_value = "default", value_parser, num_args = 1.., value_delimiter = ',', help = "Server mode: Comma-separated list of flows to manage")]
-    flows: Vec<String>,
+    pub flows: Vec<String>,
 
     /// IP address to bind the server or client to (default: 127.0.0.1)
     #[arg(
@@ -49,7 +58,7 @@ struct Args {
         default_value = "127.0.0.1",
         help = "Server mode: IP address to bind the server to"
     )]
-    ip: String,
+    pub ip: String,
 
     /// Port to bind the server or client to (default: 8080)
     #[arg(
@@ -58,7 +67,7 @@ struct Args {
         default_value = "8080",
         help = "Server mode: Port to bind the server to"
     )]
-    port: u16,
+    pub port: u16,
 
     /// Hostname or IP address of the PostgreSQL database (default: 127.0.0.1)
     #[arg(
@@ -66,7 +75,7 @@ struct Args {
         default_value = "127.0.0.1",
         help = "Server mode: Hostname or IP address of the PostgreSQL database"
     )]
-    db_host: String,
+    pub db_host: String,
 
     /// Name of the PostgreSQL database (default: khm)
     #[arg(
@@ -74,7 +83,7 @@ struct Args {
         default_value = "khm",
         help = "Server mode: Name of the PostgreSQL database"
     )]
-    db_name: String,
+    pub db_name: String,
 
     /// Username for the PostgreSQL database (required in server mode)
     #[arg(
@@ -82,7 +91,7 @@ struct Args {
         required_if_eq("server", "true"),
         help = "Server mode: Username for the PostgreSQL database"
     )]
-    db_user: Option<String>,
+    pub db_user: Option<String>,
 
     /// Password for the PostgreSQL database (required in server mode)
     #[arg(
@@ -90,7 +99,7 @@ struct Args {
         required_if_eq("server", "true"),
         help = "Server mode: Password for the PostgreSQL database"
     )]
-    db_password: Option<String>,
+    pub db_password: Option<String>,
 
     /// Host address of the server to connect to in client mode (required in client mode)
     #[arg(
@@ -98,7 +107,7 @@ struct Args {
         required_if_eq("server", "false"),
         help = "Client mode: Full host address of the server to connect to. Like https://khm.example.com"
     )]
-    host: Option<String>,
+    pub host: Option<String>,
 
     /// Flow name to use on the server
     #[arg(
@@ -106,7 +115,7 @@ struct Args {
         required_if_eq("server", "false"),
         help = "Client mode: Flow name to use on the server"
     )]
-    flow: Option<String>,
+    pub flow: Option<String>,
 
     /// Path to the known_hosts file (default: ~/.ssh/known_hosts)
     #[arg(
@@ -114,24 +123,66 @@ struct Args {
         default_value = "~/.ssh/known_hosts",
         help = "Client mode: Path to the known_hosts file"
     )]
-    known_hosts: String,
+    pub known_hosts: String,
 
     /// Basic auth string for client mode. Format: user:pass
     #[arg(long, default_value = "", help = "Client mode: Basic Auth credentials")]
-    basic_auth: String,
+    pub basic_auth: String,
 }
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    env_logger::init();
+    // Configure logging to show only khm logs, filtering out noisy library logs
+    env_logger::Builder::from_default_env()
+        .filter_level(log::LevelFilter::Warn) // Default level for all modules
+        .filter_module("khm", log::LevelFilter::Debug) // Our app logs
+        .filter_module("actix_web", log::LevelFilter::Info) // Server logs
+        .filter_module("reqwest", log::LevelFilter::Warn) // HTTP client
+        .filter_module("winit", log::LevelFilter::Error) // Window management
+        .filter_module("egui", log::LevelFilter::Error) // GUI framework
+        .filter_module("eframe", log::LevelFilter::Error) // GUI framework
+        .filter_module("tray_icon", log::LevelFilter::Error) // Tray icon
+        .filter_module("wgpu", log::LevelFilter::Error) // Graphics
+        .filter_module("naga", log::LevelFilter::Error) // Graphics
+        .filter_module("glow", log::LevelFilter::Error) // Graphics
+        .filter_module("tracing", log::LevelFilter::Error) // Tracing spans
+        .init();
+    
     info!("Starting SSH Key Manager");
 
     let args = Args::parse();
 
-    // Check if we have the minimum required arguments
-    if !args.server && (args.host.is_none() || args.flow.is_none()) {
-        // Neither server mode nor client mode properly configured
-        eprintln!("Error: You must specify either server mode (--server) or client mode (--host and --flow)");
+    // Settings UI mode - just show settings window and exit
+    if args.settings_ui {
+        #[cfg(feature = "gui")]
+        {
+            info!("Running settings UI window");
+            gui::run_settings_window();
+            return Ok(());
+        }
+        #[cfg(not(feature = "gui"))]
+        {
+            error!("GUI features not compiled. Install system dependencies and rebuild with --features gui");
+            return Err(std::io::Error::new(
+                std::io::ErrorKind::Unsupported,
+                "GUI features not compiled"
+            ));
+        }
+    }
+
+    // GUI mode has priority
+    if args.gui {
+        info!("Running in GUI mode");
+        if let Err(e) = gui::run_gui().await {
+            error!("Failed to run GUI: {}", e);
+        }
+        return Ok(());
+    }
+
+    // Check if we have the minimum required arguments for server/client mode
+    if !args.server && !args.gui && (args.host.is_none() || args.flow.is_none()) {
+        // Neither server mode nor client mode nor GUI mode properly configured
+        eprintln!("Error: You must specify either server mode (--server), client mode (--host and --flow), or GUI mode (--gui)");
         eprintln!();
         eprintln!("Examples:");
         eprintln!(
@@ -142,6 +193,14 @@ async fn main() -> std::io::Result<()> {
             "  Client mode: {} --host https://khm.example.com --flow work",
             env!("CARGO_PKG_NAME")
         );
+        eprintln!(
+            "  GUI mode: {} --gui",
+            env!("CARGO_PKG_NAME")
+        );
+        eprintln!(
+            "  Settings window: {} --gui --settings-ui",
+            env!("CARGO_PKG_NAME")
+        );
         eprintln!();
         eprintln!("Use --help for more information.");
         std::process::exit(1);

src/server.rs

@@ -305,7 +305,20 @@ pub async fn run_server(args: crate::Args) -> std::io::Result<()> {
             .app_data(web::Data::new(db_client.clone()))
             .app_data(allowed_flows.clone())
             // API routes
+            .route("/api/version", web::get().to(crate::web::get_version_api))
             .route("/api/flows", web::get().to(crate::web::get_flows_api))
+            .route(
+                "/{flow_id}/scan-dns",
+                web::post().to(crate::web::scan_dns_resolution),
+            )
+            .route(
+                "/{flow_id}/bulk-deprecate",
+                web::post().to(crate::web::bulk_deprecate_servers),
+            )
+            .route(
+                "/{flow_id}/bulk-restore",
+                web::post().to(crate::web::bulk_restore_servers),
+            )
             .route(
                 "/{flow_id}/keys/{server}",
                 web::delete().to(crate::web::delete_key_by_server),

src/web.rs

@@ -3,6 +3,12 @@ use log::info;
 use rust_embed::RustEmbed;
 use serde_json::json;
 use std::sync::Arc;
+use trust_dns_resolver::TokioAsyncResolver;
+use trust_dns_resolver::config::*;
+use serde::{Deserialize, Serialize};
+use futures::future;
+use tokio::sync::Semaphore;
+use tokio::time::{timeout, Duration};
 
 use crate::db::ReconnectingDbClient;
 use crate::server::Flows;
@@ -11,12 +17,238 @@ use crate::server::Flows;
 #[folder = "static/"]
 struct StaticAssets;
 
+#[derive(Serialize, Deserialize, Debug)]
+pub struct DnsResolutionResult {
+    pub server: String,
+    pub resolved: bool,
+    pub error: Option<String>,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct BulkDeprecateRequest {
+    pub servers: Vec<String>,
+}
+
+async fn check_dns_resolution(hostname: String, semaphore: Arc<Semaphore>) -> DnsResolutionResult {
+    let _permit = match semaphore.acquire().await {
+        Ok(permit) => permit,
+        Err(_) => {
+            return DnsResolutionResult {
+                server: hostname,
+                resolved: false,
+                error: Some("Failed to acquire semaphore".to_string()),
+            };
+        }
+    };
+
+    let resolver = TokioAsyncResolver::tokio(
+        ResolverConfig::default(),
+        ResolverOpts::default(),
+    );
+
+    let lookup_result = timeout(Duration::from_secs(5), resolver.lookup_ip(&hostname)).await;
+
+    match lookup_result {
+        Ok(Ok(_)) => DnsResolutionResult {
+            server: hostname,
+            resolved: true,
+            error: None,
+        },
+        Ok(Err(e)) => DnsResolutionResult {
+            server: hostname,
+            resolved: false,
+            error: Some(e.to_string()),
+        },
+        Err(_) => DnsResolutionResult {
+            server: hostname,
+            resolved: false,
+            error: Some("DNS lookup timeout (5s)".to_string()),
+        },
+    }
+}
+
+// API endpoint to get application version
+pub async fn get_version_api() -> Result<HttpResponse> {
+    Ok(HttpResponse::Ok().json(json!({
+        "version": env!("CARGO_PKG_VERSION")
+    })))
+}
+
 // API endpoint to get list of available flows
 pub async fn get_flows_api(allowed_flows: web::Data<Vec<String>>) -> Result<HttpResponse> {
     info!("API request for available flows");
     Ok(HttpResponse::Ok().json(&**allowed_flows))
 }
 
+// API endpoint to scan DNS resolution for all hosts in a flow
+pub async fn scan_dns_resolution(
+    flows: web::Data<Flows>,
+    path: web::Path<String>,
+    allowed_flows: web::Data<Vec<String>>,
+) -> Result<HttpResponse> {
+    let flow_id_str = path.into_inner();
+
+    info!("API request to scan DNS resolution for flow '{}'"  , flow_id_str);
+
+    if !allowed_flows.contains(&flow_id_str) {
+        return Ok(HttpResponse::Forbidden().json(json!({
+            "error": "Flow ID not allowed"
+        })));
+    }
+
+    let flows_guard = flows.lock().unwrap();
+    let flow = match flows_guard.iter().find(|flow| flow.name == flow_id_str) {
+        Some(flow) => flow,
+        None => {
+            return Ok(HttpResponse::NotFound().json(json!({
+                "error": "Flow ID not found"
+            })));
+        }
+    };
+
+    // Get unique hostnames
+    let mut hostnames: std::collections::HashSet<String> = std::collections::HashSet::new();
+    for key in &flow.servers {
+        hostnames.insert(key.server.clone());
+    }
+
+    drop(flows_guard);
+
+    info!("Scanning DNS resolution for {} unique hosts", hostnames.len());
+
+    // Limit concurrent DNS requests to prevent "too many open files" error
+    let semaphore = Arc::new(Semaphore::new(20));
+
+    // Scan all hostnames concurrently with rate limiting
+    let mut scan_futures = Vec::new();
+    for hostname in hostnames {
+        scan_futures.push(check_dns_resolution(hostname, semaphore.clone()));
+    }
+
+    let results = future::join_all(scan_futures).await;
+
+    let unresolved_count = results.iter().filter(|r| !r.resolved).count();
+    info!("DNS scan complete: {} unresolved out of {} hosts", unresolved_count, results.len());
+
+    Ok(HttpResponse::Ok().json(json!({
+        "results": results,
+        "total": results.len(),
+        "unresolved": unresolved_count
+    })))
+}
+
+// API endpoint to bulk deprecate multiple servers
+pub async fn bulk_deprecate_servers(
+    flows: web::Data<Flows>,
+    path: web::Path<String>,
+    request: web::Json<BulkDeprecateRequest>,
+    db_client: web::Data<Arc<ReconnectingDbClient>>,
+    allowed_flows: web::Data<Vec<String>>,
+) -> Result<HttpResponse> {
+    let flow_id_str = path.into_inner();
+
+    info!("API request to bulk deprecate {} servers in flow '{}'", request.servers.len(), flow_id_str);
+
+    if !allowed_flows.contains(&flow_id_str) {
+        return Ok(HttpResponse::Forbidden().json(json!({
+            "error": "Flow ID not allowed"
+        })));
+    }
+
+    // Use single bulk operation instead of loop
+    let total_deprecated = match db_client
+        .bulk_deprecate_keys_by_servers_reconnecting(request.servers.clone(), flow_id_str.clone())
+        .await
+    {
+        Ok(count) => {
+            info!("Bulk deprecated {} key(s) for {} servers", count, request.servers.len());
+            count
+        }
+        Err(e) => {
+            return Ok(HttpResponse::InternalServerError().json(json!({
+                "error": format!("Failed to bulk deprecate keys: {}", e)
+            })));
+        }
+    };
+
+    // Refresh the in-memory flows
+    let updated_flows = match db_client.get_keys_from_db_reconnecting().await {
+        Ok(flows) => flows,
+        Err(e) => {
+            return Ok(HttpResponse::InternalServerError().json(json!({
+                "error": format!("Failed to refresh flows: {}", e)
+            })));
+        }
+    };
+
+    let mut flows_guard = flows.lock().unwrap();
+    *flows_guard = updated_flows;
+
+    let response = json!({
+        "message": format!("Successfully deprecated {} key(s) for {} server(s)", total_deprecated, request.servers.len()),
+        "deprecated_count": total_deprecated,
+        "servers_processed": request.servers.len()
+    });
+
+    Ok(HttpResponse::Ok().json(response))
+}
+
+// API endpoint to bulk restore multiple servers
+pub async fn bulk_restore_servers(
+    flows: web::Data<Flows>,
+    path: web::Path<String>,
+    request: web::Json<BulkDeprecateRequest>,
+    db_client: web::Data<Arc<ReconnectingDbClient>>,
+    allowed_flows: web::Data<Vec<String>>,
+) -> Result<HttpResponse> {
+    let flow_id_str = path.into_inner();
+
+    info!("API request to bulk restore {} servers in flow '{}'", request.servers.len(), flow_id_str);
+
+    if !allowed_flows.contains(&flow_id_str) {
+        return Ok(HttpResponse::Forbidden().json(json!({
+            "error": "Flow ID not allowed"
+        })));
+    }
+
+    // Use single bulk operation
+    let total_restored = match db_client
+        .bulk_restore_keys_by_servers_reconnecting(request.servers.clone(), flow_id_str.clone())
+        .await
+    {
+        Ok(count) => {
+            info!("Bulk restored {} key(s) for {} servers", count, request.servers.len());
+            count
+        }
+        Err(e) => {
+            return Ok(HttpResponse::InternalServerError().json(json!({
+                "error": format!("Failed to bulk restore keys: {}", e)
+            })));
+        }
+    };
+
+    // Refresh the in-memory flows
+    let updated_flows = match db_client.get_keys_from_db_reconnecting().await {
+        Ok(flows) => flows,
+        Err(e) => {
+            return Ok(HttpResponse::InternalServerError().json(json!({
+                "error": format!("Failed to refresh flows: {}", e)
+            })));
+        }
+    };
+
+    let mut flows_guard = flows.lock().unwrap();
+    *flows_guard = updated_flows;
+
+    let response = json!({
+        "message": format!("Successfully restored {} key(s) for {} server(s)", total_restored, request.servers.len()),
+        "restored_count": total_restored,
+        "servers_processed": request.servers.len()
+    });
+
+    Ok(HttpResponse::Ok().json(response))
+}
+
 // API endpoint to deprecate a specific key by server name
 pub async fn delete_key_by_server(
     flows: web::Data<Flows>,

static/index.html

@@ -10,7 +10,10 @@
 <body>
     <div class="container">
         <header>
+            <div class="header-title">
                 <h1>SSH Key Manager</h1>
+                <span class="version" id="appVersion">Loading...</span>
+            </div>
             <div class="flow-selector">
                 <label for="flowSelect">Flow:</label>
                 <select id="flowSelect">
@@ -26,6 +29,14 @@
                     <span class="stat-value" id="totalKeys">0</span>
                     <span class="stat-label">Total Keys</span>
                 </div>
+                <div class="stat-item">
+                    <span class="stat-value" id="activeKeys">0</span>
+                    <span class="stat-label">Active Keys</span>
+                </div>
+                <div class="stat-item">
+                    <span class="stat-value deprecated" id="deprecatedKeys">0</span>
+                    <span class="stat-label">Deprecated Keys</span>
+                </div>
                 <div class="stat-item">
                     <span class="stat-value" id="uniqueServers">0</span>
                     <span class="stat-label">Unique Servers</span>
@@ -34,7 +45,9 @@
 
             <div class="actions-panel">
                 <button id="addKeyBtn" class="btn btn-primary">Add SSH Key</button>
+                <button id="scanDnsBtn" class="btn btn-secondary">Scan DNS Resolution</button>
                 <button id="bulkDeleteBtn" class="btn btn-danger" disabled>Deprecate Selected</button>
+                <button id="bulkRestoreBtn" class="btn btn-success" disabled style="display: none;">Restore Selected</button>
                 <button id="bulkPermanentDeleteBtn" class="btn btn-danger" disabled style="display: none;">Delete Selected</button>
                 
                 <div class="filter-controls">
@@ -129,6 +142,30 @@
         </div>
     </div>
 
+    <!-- DNS Scan Results Modal -->
+    <div id="dnsScanModal" class="modal">
+        <div class="modal-content modal-large">
+            <div class="modal-header">
+                <h2>DNS Resolution Scan Results</h2>
+                <span class="close">&times;</span>
+            </div>
+            <div class="modal-body">
+                <div id="dnsScanStats" class="scan-stats"></div>
+                <div id="unresolvedHosts" class="unresolved-hosts">
+                    <div class="section-header">
+                        <h3>Unresolved Hosts</h3>
+                        <button id="selectAllUnresolved" class="btn btn-sm btn-secondary">Select All</button>
+                    </div>
+                    <div id="unresolvedList" class="host-list"></div>
+                </div>
+                <div class="form-actions">
+                    <button type="button" class="btn btn-secondary" id="closeDnsScan">Close</button>
+                    <button type="button" class="btn btn-danger" id="deprecateUnresolved" disabled>Deprecate Selected</button>
+                </div>
+            </div>
+        </div>
+    </div>
+
     <!-- Loading Overlay -->
     <div id="loadingOverlay" class="loading-overlay">
         <div class="loading-spinner"></div>

static/khm-icon.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="4" fill="#2c3e50"/>
+  <rect x="4" y="8" width="24" height="2" rx="1" fill="#3498db"/>
+  <rect x="4" y="12" width="20" height="2" rx="1" fill="#e74c3c"/>
+  <rect x="4" y="16" width="22" height="2" rx="1" fill="#2ecc71"/>
+  <rect x="4" y="20" width="18" height="2" rx="1" fill="#f39c12"/>
+  <circle cx="24" cy="6" r="3" fill="#e67e22"/>
+  <text x="24" y="9" text-anchor="middle" font-family="Arial, sans-serif" font-size="6" fill="white">K</text>
+</svg>

static/script.js

@@ -12,6 +12,7 @@ class SSHKeyManager {
         this.showDeprecatedOnly = false;
         
         this.initializeEventListeners();
+        this.loadVersion();
         this.loadFlows();
     }
 
@@ -39,11 +40,21 @@ class SSHKeyManager {
             this.showAddKeyModal();
         });
 
+        // Scan DNS button
+        document.getElementById('scanDnsBtn').addEventListener('click', () => {
+            this.scanDnsResolution();
+        });
+
         // Bulk delete button
         document.getElementById('bulkDeleteBtn').addEventListener('click', () => {
             this.deleteSelectedKeys();
         });
 
+        // Bulk restore button
+        document.getElementById('bulkRestoreBtn').addEventListener('click', () => {
+            this.restoreSelectedKeys();
+        });
+
         // Bulk permanent delete button
         document.getElementById('bulkPermanentDeleteBtn').addEventListener('click', () => {
             this.permanentlyDeleteSelectedKeys();
@@ -110,6 +121,19 @@ class SSHKeyManager {
             this.copyKeyToClipboard();
         });
 
+        // DNS scan modal
+        document.getElementById('closeDnsScan').addEventListener('click', () => {
+            this.hideModal('dnsScanModal');
+        });
+
+        document.getElementById('selectAllUnresolved').addEventListener('click', () => {
+            this.toggleSelectAllUnresolved();
+        });
+
+        document.getElementById('deprecateUnresolved').addEventListener('click', () => {
+            this.deprecateSelectedUnresolved();
+        });
+
         // Close modals when clicking on close button or outside
         document.querySelectorAll('.modal .close').forEach(closeBtn => {
             closeBtn.addEventListener('click', (e) => {
@@ -126,6 +150,20 @@ class SSHKeyManager {
         });
     }
 
+    async loadVersion() {
+        try {
+            const response = await fetch('/api/version');
+            if (response.ok) {
+                const data = await response.json();
+                document.getElementById('appVersion').textContent = `v${data.version}`;
+            } else {
+                document.getElementById('appVersion').textContent = 'Unknown';
+            }
+        } catch (error) {
+            document.getElementById('appVersion').textContent = 'Error';
+        }
+    }
+
     async loadFlows() {
         try {
             this.showLoading();
@@ -219,9 +257,14 @@ class SSHKeyManager {
     }
 
     updateStats() {
-        document.getElementById('totalKeys').textContent = this.keys.length;
-        
+        const totalKeys = this.keys.length;
+        const deprecatedKeys = this.keys.filter(key => key.deprecated).length;
+        const activeKeys = totalKeys - deprecatedKeys;
         const uniqueServers = new Set(this.keys.map(key => key.server));
+        
+        document.getElementById('totalKeys').textContent = totalKeys;
+        document.getElementById('activeKeys').textContent = activeKeys;
+        document.getElementById('deprecatedKeys').textContent = deprecatedKeys;
         document.getElementById('uniqueServers').textContent = uniqueServers.size;
     }
 
@@ -456,12 +499,15 @@ class SSHKeyManager {
 
     updateBulkDeleteButton() {
         const bulkDeleteBtn = document.getElementById('bulkDeleteBtn');
+        const bulkRestoreBtn = document.getElementById('bulkRestoreBtn');
         const bulkPermanentDeleteBtn = document.getElementById('bulkPermanentDeleteBtn');
         
         if (this.selectedKeys.size === 0) {
-            // No keys selected - hide both buttons
+            // No keys selected - hide all buttons
             bulkDeleteBtn.disabled = true;
             bulkDeleteBtn.textContent = 'Deprecate Selected';
+            bulkRestoreBtn.style.display = 'none';
+            bulkRestoreBtn.disabled = true;
             bulkPermanentDeleteBtn.style.display = 'none';
             bulkPermanentDeleteBtn.disabled = true;
             return;
@@ -491,6 +537,16 @@ class SSHKeyManager {
             bulkDeleteBtn.textContent = 'Deprecate Selected';
         }
 
+        // Show/hide restore button
+        if (deprecatedCount > 0) {
+            bulkRestoreBtn.style.display = 'inline-flex';
+            bulkRestoreBtn.disabled = false;
+            bulkRestoreBtn.textContent = `Restore Selected (${deprecatedCount})`;
+        } else {
+            bulkRestoreBtn.style.display = 'none';
+            bulkRestoreBtn.disabled = true;
+        }
+
         // Show/hide permanent delete button
         if (deprecatedCount > 0) {
             bulkPermanentDeleteBtn.style.display = 'inline-flex';
@@ -703,6 +759,56 @@ class SSHKeyManager {
         }
     }
 
+    async restoreSelectedKeys() {
+        if (this.selectedKeys.size === 0) return;
+
+        // Filter only deprecated keys
+        const deprecatedKeys = Array.from(this.selectedKeys).filter(keyId => {
+            const key = this.findKeyById(keyId);
+            return key && key.deprecated;
+        });
+
+        if (deprecatedKeys.length === 0) {
+            this.showToast('No deprecated keys selected', 'warning');
+            return;
+        }
+
+        if (!confirm(`Are you sure you want to restore ${deprecatedKeys.length} deprecated SSH keys?`)) {
+            return;
+        }
+
+        // Get unique server names
+        const serverNames = [...new Set(deprecatedKeys.map(keyId => {
+            const key = this.findKeyById(keyId);
+            return key ? key.server : null;
+        }).filter(Boolean))];
+
+        try {
+            this.showLoading();
+            
+            const response = await fetch(`/${this.currentFlow}/bulk-restore`, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify({ servers: serverNames })
+            });
+
+            if (!response.ok) {
+                const errorText = await response.text();
+                throw new Error(errorText || 'Failed to restore keys');
+            }
+
+            const result = await response.json();
+            this.showToast(result.message, 'success');
+            await this.loadKeys();
+        } catch (error) {
+            this.showToast('Failed to restore selected keys: ' + error.message, 'error');
+        } finally {
+            this.hideLoading();
+        }
+    }
+
     async permanentlyDeleteSelectedKeys() {
         if (this.selectedKeys.size === 0) return;
 
@@ -805,6 +911,8 @@ class SSHKeyManager {
         document.getElementById('keysTableBody').innerHTML = '';
         document.getElementById('noKeysMessage').style.display = 'block';
         document.getElementById('totalKeys').textContent = '0';
+        document.getElementById('activeKeys').textContent = '0';
+        document.getElementById('deprecatedKeys').textContent = '0';
         document.getElementById('uniqueServers').textContent = '0';
         this.selectedKeys.clear();
         this.updateBulkDeleteButton();
@@ -849,6 +957,150 @@ class SSHKeyManager {
             }, 300);
         }, 4000);
     }
+
+    // DNS Resolution Scanning
+    async scanDnsResolution() {
+        if (!this.currentFlow) {
+            this.showToast('Please select a flow first', 'warning');
+            return;
+        }
+
+        try {
+            this.showLoading();
+            const response = await fetch(`/${this.currentFlow}/scan-dns`, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                },
+            });
+
+            if (!response.ok) {
+                const errorText = await response.text();
+                throw new Error(errorText || 'Failed to scan DNS resolution');
+            }
+
+            const scanResults = await response.json();
+            this.showDnsScanResults(scanResults);
+        } catch (error) {
+            this.showToast('Failed to scan DNS resolution: ' + error.message, 'error');
+        } finally {
+            this.hideLoading();
+        }
+    }
+
+    showDnsScanResults(scanResults) {
+        const { results, total, unresolved } = scanResults;
+        
+        // Update stats
+        const statsDiv = document.getElementById('dnsScanStats');
+        statsDiv.innerHTML = `
+            <div class="scan-stat">
+                <span class="scan-stat-value">${total}</span>
+                <span class="scan-stat-label">Total Hosts</span>
+            </div>
+            <div class="scan-stat">
+                <span class="scan-stat-value">${total - unresolved}</span>
+                <span class="scan-stat-label">Resolved</span>
+            </div>
+            <div class="scan-stat">
+                <span class="scan-stat-value unresolved-count">${unresolved}</span>
+                <span class="scan-stat-label">Unresolved</span>
+            </div>
+        `;
+
+        // Show unresolved hosts
+        const unresolvedHosts = results.filter(r => !r.resolved);
+        const unresolvedList = document.getElementById('unresolvedList');
+        
+        if (unresolvedHosts.length === 0) {
+            unresolvedList.innerHTML = '<div class="empty-state">🎉 All hosts resolved successfully!</div>';
+            document.getElementById('selectAllUnresolved').style.display = 'none';
+        } else {
+            document.getElementById('selectAllUnresolved').style.display = 'inline-flex';
+            unresolvedList.innerHTML = unresolvedHosts.map(host => `
+                <div class="host-item">
+                    <label>
+                        <input type="checkbox" value="${this.escapeHtml(host.server)}" class="unresolved-checkbox">
+                        <span class="host-name">${this.escapeHtml(host.server)}</span>
+                    </label>
+                    ${host.error ? `<span class="host-error">${this.escapeHtml(host.error)}</span>` : ''}
+                </div>
+            `).join('');
+
+            // Add event listeners to checkboxes
+            unresolvedList.querySelectorAll('.unresolved-checkbox').forEach(checkbox => {
+                checkbox.addEventListener('change', () => {
+                    this.updateDeprecateUnresolvedButton();
+                });
+            });
+        }
+
+        this.updateDeprecateUnresolvedButton();
+        this.showModal('dnsScanModal');
+    }
+
+    toggleSelectAllUnresolved() {
+        const checkboxes = document.querySelectorAll('.unresolved-checkbox');
+        const allChecked = Array.from(checkboxes).every(cb => cb.checked);
+        
+        checkboxes.forEach(checkbox => {
+            checkbox.checked = !allChecked;
+        });
+        
+        this.updateDeprecateUnresolvedButton();
+    }
+
+    updateDeprecateUnresolvedButton() {
+        const selectedCount = document.querySelectorAll('.unresolved-checkbox:checked').length;
+        const deprecateBtn = document.getElementById('deprecateUnresolved');
+        
+        if (selectedCount > 0) {
+            deprecateBtn.disabled = false;
+            deprecateBtn.textContent = `Deprecate Selected (${selectedCount})`;
+        } else {
+            deprecateBtn.disabled = true;
+            deprecateBtn.textContent = 'Deprecate Selected';
+        }
+    }
+
+    async deprecateSelectedUnresolved() {
+        const selectedHosts = Array.from(document.querySelectorAll('.unresolved-checkbox:checked'))
+            .map(cb => cb.value);
+
+        if (selectedHosts.length === 0) {
+            this.showToast('No hosts selected', 'warning');
+            return;
+        }
+
+        if (!confirm(`Are you sure you want to deprecate SSH keys for ${selectedHosts.length} unresolved hosts?`)) {
+            return;
+        }
+
+        try {
+            this.showLoading();
+            const response = await fetch(`/${this.currentFlow}/bulk-deprecate`, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify({ servers: selectedHosts })
+            });
+
+            if (!response.ok) {
+                const errorText = await response.text();
+                throw new Error(errorText || 'Failed to deprecate hosts');
+            }
+
+            const result = await response.json();
+            this.showToast(result.message, 'success');
+            this.hideModal('dnsScanModal');
+            await this.loadKeys();
+        } catch (error) {
+            this.showToast('Failed to deprecate hosts: ' + error.message, 'error');
+        } finally {
+            this.hideLoading();
+        }
+    }
 }
 
 // Initialize the SSH Key Manager when the page loads

static/style.css

@@ -50,6 +50,23 @@ header h1 {
     font-size: 2.5rem;
     font-weight: 600;
     color: var(--text-primary);
+    margin: 0;
+}
+
+.header-title {
+    display: flex;
+    align-items: baseline;
+    gap: 1rem;
+}
+
+.version {
+    font-size: 0.875rem;
+    color: var(--text-secondary);
+    background: var(--background);
+    padding: 0.25rem 0.5rem;
+    border-radius: var(--border-radius);
+    font-weight: 500;
+    border: 1px solid var(--border);
 }
 
 .flow-selector {
@@ -155,6 +172,10 @@ header h1 {
     color: var(--primary-color);
 }
 
+.stat-value.deprecated {
+    color: var(--danger-color);
+}
+
 .stat-label {
     color: var(--text-secondary);
     font-size: 0.875rem;
@@ -590,6 +611,16 @@ header h1 {
         align-items: stretch;
     }
 
+    .header-title {
+        flex-direction: column;
+        align-items: flex-start;
+        gap: 0.5rem;
+    }
+
+    .header-title h1 {
+        font-size: 2rem;
+    }
+
     .actions-panel {
         flex-direction: column;
         align-items: stretch;
@@ -663,3 +694,132 @@ input[type="checkbox"]:indeterminate {
 .form-group textarea:valid {
     border-color: var(--success-color);
 }
+
+/* DNS Scan Modal Styles */
+.modal-large {
+    max-width: 800px;
+}
+
+.scan-stats {
+    background: var(--background);
+    padding: 1rem;
+    border-radius: var(--border-radius);
+    margin-bottom: 1.5rem;
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
+    gap: 1rem;
+}
+
+.scan-stat {
+    text-align: center;
+}
+
+.scan-stat-value {
+    display: block;
+    font-size: 1.5rem;
+    font-weight: 600;
+    color: var(--primary-color);
+}
+
+.scan-stat-label {
+    color: var(--text-secondary);
+    font-size: 0.875rem;
+}
+
+.unresolved-count {
+    color: var(--danger-color) !important;
+}
+
+.section-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 1rem;
+}
+
+.section-header h3 {
+    font-size: 1.125rem;
+    font-weight: 600;
+    color: var(--text-primary);
+}
+
+.host-list {
+    max-height: 300px;
+    overflow-y: auto;
+    border: 1px solid var(--border);
+    border-radius: var(--border-radius);
+}
+
+.host-item {
+    display: flex;
+    align-items: center;
+    padding: 0.75rem;
+    border-bottom: 1px solid var(--border);
+    transition: background-color 0.2s ease;
+}
+
+.host-item:last-child {
+    border-bottom: none;
+}
+
+.host-item:hover {
+    background-color: var(--background);
+}
+
+.host-item label {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    flex: 1;
+    cursor: pointer;
+    margin: 0;
+}
+
+.host-name {
+    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
+    font-weight: 500;
+    color: var(--text-primary);
+}
+
+.host-error {
+    font-size: 0.75rem;
+    color: var(--danger-color);
+    margin-left: auto;
+    max-width: 200px;
+    word-break: break-word;
+}
+
+.empty-state {
+    text-align: center;
+    padding: 2rem;
+    color: var(--text-secondary);
+    font-style: italic;
+}
+
+.scan-progress {
+    background: var(--background);
+    padding: 1rem;
+    border-radius: var(--border-radius);
+    margin-bottom: 1rem;
+    text-align: center;
+}
+
+.scan-progress-text {
+    color: var(--text-secondary);
+    margin-bottom: 0.5rem;
+}
+
+.progress-bar {
+    width: 100%;
+    height: 8px;
+    background: var(--border);
+    border-radius: 4px;
+    overflow: hidden;
+}
+
+.progress-fill {
+    height: 100%;
+    background: var(--primary-color);
+    transition: width 0.3s ease;
+    border-radius: 4px;
+}