Tray: separate tray and window processes; device list without self

The tray process holds only the icon and starts the same binary with
--window on Open; the window ends when closed, which works on Wayland where
a window cannot be hidden. The devices table now names devices as
hostname (id5), leaves out this device and counts the others.

Co-Authored-By: Claude <noreply@anthropic.com>

crates/tsunagi-tray/src/devices.rs

@@ -23,22 +23,51 @@ pub(crate) fn title(network: &NetworkReport) -> String {
 /// One row of the device table, built from a tunnel and/or a signed member.
 struct Device<'a> {
     online: bool,
-    name: String,
-    /// What clicking the name copies: `hostname.network` so it resolves, or
-    /// the short id when there is no hostname.
-    copy: String,
+    /// The last hostname seen for it, kept while it is offline.
+    hostname: Option<&'a str>,
+    /// What clicking the hostname copies: `hostname.network`, so it resolves.
+    copy: Option<String>,
+    /// The full endpoint id, which clicking the short form copies.
+    id: &'a str,
     proto: &'a str,
     address: Option<String>,
     handshake_secs: Option<u64>,
     overlay: Option<&'a OverlayPeerReport>,
 }
 
+impl Device<'_> {
+    fn sort_key(&self) -> String {
+        self.hostname.unwrap_or(self.id).to_lowercase()
+    }
+}
+
+/// The first characters of an endpoint id, enough to tell devices apart.
+fn short_id(id: &str) -> String {
+    id.chars().take(5).collect()
+}
+
+/// The device cell: the hostname and, in brackets, the start of the id.
+/// Clicking either copies its own full value.
+fn name_cell(ui: &mut egui::Ui, device: &Device<'_>) {
+    ui.horizontal(|ui| {
+        ui.spacing_mut().item_spacing.x = 4.0;
+        match (device.hostname, &device.copy) {
+            (Some(hostname), Some(copy)) => {
+                format::copy_field(ui, hostname, copy);
+                format::copy_field(ui, &format!("({})", short_id(device.id)), device.id);
+            }
+            _ => format::copy_field(ui, &short_id(device.id), device.id),
+        }
+    });
+}
+
 /// Draws the window body into its viewport.
 pub(crate) fn show(
     ctx: &egui::Context,
     _agent: &AgentClient,
     unit: &mut Unit,
     network: &NetworkReport,
+    own_id: &str,
     traffic: &Traffic,
 ) {
     egui::CentralPanel::default().show(ctx, |ui| {
@@ -60,7 +89,7 @@ pub(crate) fn show(
         format::sparkline(ui, traffic.network(&network.network_id), unit, 48.0);
         ui.add_space(8.0);
 
-        let devices = devices(network);
+        let devices = devices(network, own_id);
         let online = devices.iter().filter(|d| d.online).count();
         ui.label(
             egui::RichText::new(format!(
@@ -123,31 +152,56 @@ fn summary(ui: &mut egui::Ui, network: &NetworkReport) {
         });
 }
 
+/// Every other device this network knows of, from a live tunnel or the signed
+/// membership. This device is in the roster too but is not one of the others.
+fn known_ids<'a>(network: &'a NetworkReport, own_id: &str) -> Vec<&'a str> {
+    let overlay_peers = network
+        .overlay
+        .as_ref()
+        .map(|o| o.peers.as_slice())
+        .unwrap_or(&[]);
+    let mut ids: Vec<&str> = Vec::new();
+    let candidates = overlay_peers
+        .iter()
+        .map(|p| p.endpoint_id.as_str())
+        .chain(network.peers.iter().map(|p| p.endpoint_id.as_str()))
+        .chain(network.members.iter().map(|m| m.endpoint_id.as_str()));
+    for id in candidates {
+        if id != own_id && !ids.contains(&id) {
+            ids.push(id);
+        }
+    }
+    ids
+}
+
+/// How many other devices this network knows of, connected or not.
+pub(crate) fn known_count(network: &NetworkReport, own_id: &str) -> usize {
+    known_ids(network, own_id).len()
+}
+
 /// Builds the device list: every endpoint known from a live tunnel or the
 /// signed membership, online ones first.
-fn devices(network: &NetworkReport) -> Vec<Device<'_>> {
-    let hostnames: HashMap<&str, &str> = network
-        .peers
+fn devices<'a>(network: &'a NetworkReport, own_id: &str) -> Vec<Device<'a>> {
+    // The signed members carry the last name seen, so a device that is away
+    // is still called by it; a live announcement is fresher and wins.
+    let mut hostnames: HashMap<&str, &str> = network
+        .members
         .iter()
-        .filter_map(|p| p.hostname.as_deref().map(|h| (p.endpoint_id.as_str(), h)))
+        .filter_map(|m| m.hostname.as_deref().map(|h| (m.endpoint_id.as_str(), h)))
         .collect();
+    hostnames.extend(
+        network
+            .peers
+            .iter()
+            .filter_map(|p| p.hostname.as_deref().map(|h| (p.endpoint_id.as_str(), h))),
+    );
     let overlay_peers = network
         .overlay
         .as_ref()
         .map(|o| o.peers.as_slice())
         .unwrap_or(&[]);
 
-    let mut ids: Vec<&str> = Vec::new();
-    for peer in overlay_peers {
-        if !ids.contains(&peer.endpoint_id.as_str()) {
-            ids.push(&peer.endpoint_id);
-        }
-    }
-    for member in &network.members {
-        if !ids.contains(&member.endpoint_id.as_str()) {
-            ids.push(&member.endpoint_id);
-        }
-    }
+    let ids = known_ids(network, own_id);
 
     let mut devices: Vec<Device> = ids
         .into_iter()
@@ -156,15 +210,11 @@ fn devices(network: &NetworkReport) -> Vec<Device<'_>> {
             let member = network.members.iter().find(|m| m.endpoint_id == id);
             let online = overlay.is_some_and(|p| p.handshake_secs_ago.is_some());
             let hostname = hostnames.get(id).copied();
-            let name = hostname.map_or_else(
-                || format::short(overlay.map_or(id, |p| p.public_key.as_str())),
-                str::to_string,
-            );
-            let copy = hostname.map_or_else(|| name.clone(), |h| format!("{h}.{}", network.name));
             Device {
                 online,
-                name,
-                copy,
+                hostname,
+                copy: hostname.map(|h| format!("{h}.{}", network.name)),
+                id,
                 proto: overlay.map_or("—", |p| p.protocol.as_str()),
                 address: overlay
                     .and_then(|p| p.address.clone())
@@ -178,7 +228,7 @@ fn devices(network: &NetworkReport) -> Vec<Device<'_>> {
     devices.sort_by(|a, b| {
         b.online
             .cmp(&a.online)
-            .then_with(|| a.name.to_lowercase().cmp(&b.name.to_lowercase()))
+            .then_with(|| a.sort_key().cmp(&b.sort_key()))
     });
     devices
 }
@@ -216,7 +266,7 @@ fn device_table(
             ui.end_row();
 
             for device in devices {
-                format::copy_field(ui, &device.name, &device.copy);
+                name_cell(ui, device);
                 ui.label(device.proto);
                 match &device.address {
                     Some(address) => format::copy_field(ui, address, address),