fix(download): persist download state across views

- Add downloadStateVersion prop to trigger reactivity in child components
- Use version in each block keys to force re-evaluation when state changes
- Ensures download status persists whether track was downloaded from
  album view or playlist view

src/lib/components/views/AlbumDetailView.svelte

@@ -52,6 +52,7 @@
     onTrackRemoveDownload?: (trackId: number) => void;
     getTrackDownloadStatus?: (trackId: number) => { status: DownloadStatus; progress: number };
     onDownloadAlbum?: () => void;
+    downloadStateVersion?: number;
   }
 
   let {
@@ -73,7 +74,8 @@
     onTrackDownload,
     onTrackRemoveDownload,
     getTrackDownloadStatus,
-    onDownloadAlbum
+    onDownloadAlbum,
+    downloadStateVersion
   }: Props = $props();
 
   let currentTrack = $state<number | null>(null);
@@ -215,7 +217,7 @@
 
     <!-- Track Rows -->
     <div class="tracks">
-      {#each album.tracks as track}
+      {#each album.tracks as track (`${track.id}-${downloadStateVersion}`)}
         {@const downloadInfo = getTrackDownloadStatus?.(track.id) ?? { status: 'none' as const, progress: 0 }}
         <TrackRow
           number={track.number}

src/lib/components/views/PlaylistDetailView.svelte

@@ -75,6 +75,7 @@
     onTrackDownload?: (track: DisplayTrack) => void;
     onTrackRemoveDownload?: (trackId: number) => void;
     getTrackDownloadStatus?: (trackId: number) => { status: DownloadStatus; progress: number };
+    downloadStateVersion?: number;
   }
 
   let {
@@ -91,7 +92,8 @@
     onTrackGoToArtist,
     onTrackDownload,
     onTrackRemoveDownload,
-    getTrackDownloadStatus
+    getTrackDownloadStatus,
+    downloadStateVersion
   }: Props = $props();
 
   let playlist = $state<Playlist | null>(null);
@@ -500,7 +502,7 @@
         <span class="col-duration">Duration</span>
       </div>
 
-      {#each displayTracks as track, idx (track.id)}
+      {#each displayTracks as track, idx (`${track.id}-${downloadStateVersion}`)}
         {@const downloadInfo = getTrackDownloadStatus?.(track.id) ?? { status: 'none' as const, progress: 0 }}
         <TrackRow
           number={idx + 1}

src/routes/+page.svelte

@@ -1590,6 +1590,7 @@
           onTrackRemoveDownload={handleTrackRemoveDownload}
           getTrackDownloadStatus={getTrackDownloadStatus}
           onDownloadAlbum={handleDownloadAlbum}
+          {downloadStateVersion}
         />
       {:else if activeView === 'artist' && selectedArtist}
         <ArtistDetailView
@@ -1629,6 +1630,7 @@
           onTrackDownload={handleDisplayTrackDownload}
           onTrackRemoveDownload={handleTrackRemoveDownload}
           getTrackDownloadStatus={getTrackDownloadStatus}
+          {downloadStateVersion}
         />
       {:else if activeView === 'favorites'}
         <FavoritesView