feat(local-library): implement playback context tracking

Add proper context tracking for Local Library playback so the stack
icon shows correctly when playing from Local Library.

Changes:
- Add 'local_library' to ContextType enum (frontend and backend)
- Add 'Local Library' display label in context info
- Import setPlaybackContext in LocalLibraryView
- Call setPlaybackContext when playing tracks from Local Library
  - For album view: context is the album with album title
  - For tracks view: context is "Local Tracks"
- Track IDs and position are properly set for context navigation

Fixes issue where Local Library playback showed stale Qobuz context.

cc

src-tauri/src/playback_context/mod.rs

@@ -22,6 +22,7 @@ pub enum ContextType {
     ArtistTop,
     HomeList,
     Favorites,
+    LocalLibrary,
 }
 
 /// Source of the content (Qobuz or Local Library)
@@ -120,6 +121,7 @@ impl PlaybackContext {
             ContextType::ArtistTop => "Artist Top Songs",
             ContextType::HomeList => "Home List",
             ContextType::Favorites => "Favorites",
+            ContextType::LocalLibrary => "Local Library",
         };
         format!("{} · {}", type_str, self.label)
     }

src/lib/components/views/LocalLibraryView.svelte

@@ -24,6 +24,9 @@
     subscribe as subscribeOffline,
     isOffline as checkIsOffline
   } from '$lib/stores/offlineStore';
+  import {
+    setPlaybackContext
+  } from '$lib/stores/playbackContextStore';
 
   // Backend types matching Rust models
   interface LocalTrack {
@@ -716,10 +719,34 @@
     try {
       if (selectedAlbum && albumTracks.length > 0) {
         const trackIndex = albumTracks.findIndex(t => t.id === track.id);
+        const trackIds = albumTracks.map(t => t.id);
+
+        // Set playback context for Local Library album
+        await setPlaybackContext(
+          'local_library',
+          selectedAlbum.id,
+          selectedAlbum.title,
+          'local',
+          trackIds,
+          trackIndex >= 0 ? trackIndex : 0
+        );
+
         await setQueueForAlbumTracks(albumTracks, trackIndex >= 0 ? trackIndex : 0);
       } else if (activeTab === 'tracks' && tracks.length > 0) {
         const orderedTracks = getDisplayedTrackOrder();
         const trackIndex = orderedTracks.findIndex(t => t.id === track.id);
+        const trackIds = orderedTracks.map(t => t.id);
+
+        // Set playback context for Local Library tracks view
+        await setPlaybackContext(
+          'local_library',
+          'local-tracks',
+          'Local Tracks',
+          'local',
+          trackIds,
+          trackIndex >= 0 ? trackIndex : 0
+        );
+
         await setQueueForLocalTracks(orderedTracks, trackIndex >= 0 ? trackIndex : 0);
       }
 

src/lib/stores/playbackContextStore.ts

@@ -9,7 +9,7 @@ import { invoke } from '@tauri-apps/api/core';
 
 // ============ Types ============
 
-export type ContextType = 'album' | 'playlist' | 'artist_top' | 'home_list' | 'favorites';
+export type ContextType = 'album' | 'playlist' | 'artist_top' | 'home_list' | 'favorites' | 'local_library';
 export type ContentSource = 'qobuz' | 'local';
 
 export interface PlaybackContext {
@@ -138,7 +138,8 @@ export function getContextDisplayInfo(): string | null {
     playlist: 'Playlist',
     artist_top: 'Artist Top Songs',
     home_list: 'Home List',
-    favorites: 'Favorites'
+    favorites: 'Favorites',
+    local_library: 'Local Library'
   }[currentContext.type];
 
   return `${typeStr} · ${currentContext.label}`;