Remove dead code and #![allow(dead_code)] blanket suppressions

- Delete src/audio/queue.rs (321 lines, PlayQueue never used)
- Remove #![allow(dead_code)] from audio, subsonic, and mpris module roots
- Remove unused MpvEvent2 enum, playlist_clear, get_volume, get_path,
  is_eof, observe_property from mpv.rs
- Remove unused DEFAULT_DEVICE_ID, is_available, get_effective_rate
  from pipewire.rs (and associated dead test)
- Remove unused search(), get_cover_art_url() from subsonic client
- Remove unused SearchResult3Data, SearchResult3 model structs
- Move parse_song_id_from_url into #[cfg(test)] block (only used by tests)
- Add targeted #[allow(dead_code)] on deserialization-only fields
  (MpvEvent, SubsonicResponseInner.version, ArtistIndex.name)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/actions.rs

@@ -1,12 +1,8 @@
 //! Application actions and message passing
 
-use crate::subsonic::models::{Album, Artist, Child, Playlist};
-
 /// Actions that can be sent to the audio backend
 #[derive(Debug, Clone)]
 pub enum AudioAction {
-    /// Play a specific song by URL
-    Play { url: String, song: Child },
     /// Pause playback
     Pause,
     /// Resume playback
@@ -26,86 +22,3 @@ pub enum AudioAction {
     /// Set volume (0-100)
     SetVolume(i32),
 }
-
-/// Actions that can be sent to update the UI
-#[derive(Debug, Clone)]
-pub enum UiAction {
-    /// Update playback position
-    UpdatePosition { position: f64, duration: f64 },
-    /// Update playback state
-    UpdatePlaybackState(PlaybackStateUpdate),
-    /// Update audio properties
-    UpdateAudioProperties {
-        sample_rate: Option<u32>,
-        bit_depth: Option<u32>,
-        format: Option<String>,
-    },
-    /// Track ended (EOF from MPV)
-    TrackEnded,
-    /// Show notification
-    Notify { message: String, is_error: bool },
-    /// Artists loaded from server
-    ArtistsLoaded(Vec<Artist>),
-    /// Albums loaded for an artist
-    AlbumsLoaded {
-        artist_id: String,
-        albums: Vec<Album>,
-    },
-    /// Songs loaded for an album
-    SongsLoaded { album_id: String, songs: Vec<Child> },
-    /// Playlists loaded from server
-    PlaylistsLoaded(Vec<Playlist>),
-    /// Playlist songs loaded
-    PlaylistSongsLoaded {
-        playlist_id: String,
-        songs: Vec<Child>,
-    },
-    /// Server connection test result
-    ConnectionTestResult { success: bool, message: String },
-    /// Force redraw
-    Redraw,
-}
-
-/// Playback state update
-#[derive(Debug, Clone, Copy)]
-pub enum PlaybackStateUpdate {
-    Playing,
-    Paused,
-    Stopped,
-}
-
-/// Actions for the Subsonic client
-#[derive(Debug, Clone)]
-pub enum SubsonicAction {
-    /// Fetch all artists
-    FetchArtists,
-    /// Fetch albums for an artist
-    FetchAlbums { artist_id: String },
-    /// Fetch songs for an album
-    FetchAlbum { album_id: String },
-    /// Fetch all playlists
-    FetchPlaylists,
-    /// Fetch songs in a playlist
-    FetchPlaylist { playlist_id: String },
-    /// Test server connection
-    TestConnection,
-}
-
-/// Queue manipulation actions
-#[derive(Debug, Clone)]
-pub enum QueueAction {
-    /// Append songs to queue
-    Append(Vec<Child>),
-    /// Insert songs after current position
-    InsertNext(Vec<Child>),
-    /// Clear the queue
-    Clear,
-    /// Remove song at index
-    Remove(usize),
-    /// Move song from one index to another
-    Move { from: usize, to: usize },
-    /// Shuffle the queue (keeping current song in place)
-    Shuffle,
-    /// Play song at queue index
-    PlayIndex(usize),
-}

src/app/state.rs

@@ -32,16 +32,6 @@ impl Page {
         }
     }
 
-    pub fn from_index(index: usize) -> Self {
-        match index {
-            0 => Page::Artists,
-            1 => Page::Queue,
-            2 => Page::Playlists,
-            3 => Page::Server,
-            4 => Page::Settings,
-            _ => Page::Artists,
-        }
-    }
 
     pub fn label(&self) -> &'static str {
         match self {
@@ -205,6 +195,8 @@ pub struct SettingsState {
     pub theme_index: usize,
     /// Cava visualizer enabled
     pub cava_enabled: bool,
+    /// Cava visualizer height percentage (10-80, step 5)
+    pub cava_size: u8,
 }
 
 impl Default for SettingsState {
@@ -214,6 +206,7 @@ impl Default for SettingsState {
             themes: vec![ThemeData::default_theme()],
             theme_index: 0,
             cava_enabled: false,
+            cava_size: 40,
         }
     }
 }
@@ -269,10 +262,8 @@ pub struct Notification {
 #[derive(Debug, Clone, Default)]
 pub struct LayoutAreas {
     pub header: Rect,
-    pub cava: Option<Rect>,
     pub content: Rect,
     pub now_playing: Rect,
-    pub footer: Rect,
     /// Left pane for dual-pane pages (Artists tree, Playlists list)
     pub content_left: Option<Rect>,
     /// Right pane for dual-pane pages (Songs list)
@@ -349,6 +340,7 @@ impl AppState {
         state.server_state.password = config.password.clone();
         // Initialize cava from config
         state.settings_state.cava_enabled = config.cava;
+        state.settings_state.cava_size = config.cava_size.clamp(10, 80);
         state
     }