Added nix files. revorked queue append, added library migration.

src/app/action.rs

@@ -38,6 +38,8 @@ pub enum Action {
     OpenCurrentTrackInfo,
     QueueAddNext,
     QueueAddLast,
+    MoveQueueUp,
+    MoveQueueDown,
     /// Download the selected federated track(s) into the local library.
     DownloadSelected,
     RemoveFromQueue,
@@ -107,6 +109,8 @@ impl Action {
             | Action::OpenListenHistory => Category::Playback,
             Action::QueueAddNext
             | Action::QueueAddLast
+            | Action::MoveQueueUp
+            | Action::MoveQueueDown
             | Action::DownloadSelected
             | Action::RemoveFromQueue
             | Action::ClearQueue
@@ -193,6 +197,8 @@ impl Action {
             Action::OpenCurrentTrackInfo => "Current track info".into(),
             Action::QueueAddNext => "Queue: add next".into(),
             Action::QueueAddLast => "Queue: add to end".into(),
+            Action::MoveQueueUp => "Queue: move track/selection up".into(),
+            Action::MoveQueueDown => "Queue: move track/selection down".into(),
             Action::DownloadSelected => "Federation: download to library".into(),
             Action::RemoveFromQueue => "Queue: remove selected".into(),
             Action::ClearQueue => "Queue: clear".into(),