fix(radio): prevent macOS WKWebView crash + shuffle Artist Radio queue

- Remove currentTime from Zustand persist partialize: it caused 100ms
  localStorage writes that grew with the queue, crashing WKWebView SQLite
  after ~10 min of Artist Radio on macOS
- Trim old played radio tracks from queue (keep last 5) to cap localStorage
  payload size during proactive radio top-up in next()
- Add reconnect logic for internet radio stall events (max 5 retries)
- Shuffle initial Artist Radio queue via Fisher-Yates so positions 2+
  are drawn from similar-artist tracks, not predictable top-5 tracks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/ContextMenu.tsx

@@ -23,6 +23,16 @@ function sanitizeFilename(name: string): string {
     .substring(0, 200) || 'download';
 }
 
+/** Fisher-Yates in-place shuffle — returns a new array, does not mutate the input. */
+function shuffleArray<T>(arr: T[]): T[] {
+  const result = [...arr];
+  for (let i = result.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [result[i], result[j]] = [result[j], result[i]];
+  }
+  return result;
+}
+
 // ── Add-to-Playlist submenu ───────────────────────────────────────
 export function AddToPlaylistSubmenu({ songIds, onDone, dropDown }: { songIds: string[]; onDone: () => void; dropDown?: boolean }) {
   const { t } = useTranslation();
@@ -221,12 +231,16 @@ export default function ContextMenu() {
       }
       // Load radio queue in background — enqueueRadio replaces any pending radio
       // tracks so clicking "Start Radio" again never stacks duplicate batches.
+      // Shuffle so the follow-up tracks feel fresh instead of always being the
+      // same "Top 5" in the same order every time.
       try {
         const [similar, top] = await Promise.all([getSimilarSongs2(artistId), getTopSongs(artistName)]);
-        const radioTracks = [...top, ...similar]
+        const radioTracks = shuffleArray(
+          [...top, ...similar]
             .map(songToTrack)
             .filter(t => t.id !== seedTrack.id)
-          .map(t => ({ ...t, radioAdded: true as const }));
+            .map(t => ({ ...t, radioAdded: true as const }))
+        );
         if (radioTracks.length > 0) usePlayerStore.getState().enqueueRadio(radioTracks, artistId);
       } catch (e) {
         console.error('Failed to load radio queue', e);
@@ -238,11 +252,17 @@ export default function ContextMenu() {
       const similarPromise = getSimilarSongs2(artistId).catch(() => [] as Awaited<ReturnType<typeof getSimilarSongs2>>);
       try {
         const top = await getTopSongs(artistName);
-        const topTracks = top.map(t => ({ ...songToTrack(t), radioAdded: true as const }));
+        // Shuffle so each Radio session starts from a different track rather
+        // than always kicking off with the #1 most-played song.
+        const topTracks = shuffleArray(
+          top.map(t => ({ ...songToTrack(t), radioAdded: true as const }))
+        );
         if (topTracks.length === 0) {
           // No local top songs — fall back to waiting for similar tracks
           const similar = await similarPromise;
-          const fallback = similar.map(t => ({ ...songToTrack(t), radioAdded: true as const }));
+          const fallback = shuffleArray(
+            similar.map(t => ({ ...songToTrack(t), radioAdded: true as const }))
+          );
           if (fallback.length === 0) return;
           const state = usePlayerStore.getState();
           if (state.currentTrack) {
@@ -253,22 +273,29 @@ export default function ContextMenu() {
           }
           return;
         }
-        // Start playback immediately from top songs
+        // Start playback from the first shuffled top track only.
+        // No other tracks are queued yet — positions 2+ will be filled
+        // exclusively by the similar-songs result below.
         const state = usePlayerStore.getState();
         if (state.currentTrack) {
-          state.enqueueRadio(topTracks, artistId);
+          state.enqueueRadio([topTracks[0]], artistId);
         } else {
           state.setRadioArtistId(artistId);
-          playTrack(topTracks[0], topTracks);
+          playTrack(topTracks[0], [topTracks[0]]);
         }
-        // Enrich with similar tracks in the background
+        // Populate positions 2+ from similar songs only — never from the
+        // remaining top tracks.  Mixing in topTracks.slice(1) meant that when
+        // getSimilarSongs2 returned nothing (no Last.fm, small library, etc.)
+        // the queue fell back to the same top-4 the user just heard.
+        // If similarTracks is also empty, the proactive top-up in next()
+        // will refill the queue when the first track nears its end.
         similarPromise.then(similar => {
-          const similarTracks = similar
+          const similarTracks = shuffleArray(
+            similar
               .map(t => ({ ...songToTrack(t), radioAdded: true as const }))
-            .filter(t => !topTracks.some(top => top.id === t.id));
+              .filter(t => t.id !== topTracks[0].id)
+          );
           if (similarTracks.length === 0) return;
-          // Collect pending (upcoming) radio tracks so enqueueRadio re-inserts them
-          // together with the new similar tracks rather than losing them.
           const { queue, queueIndex } = usePlayerStore.getState();
           const pendingRadio = queue.slice(queueIndex + 1).filter(t => t.radioAdded);
           usePlayerStore.getState().enqueueRadio([...pendingRadio, ...similarTracks], artistId);

src/store/playerStore.ts

@@ -203,6 +203,11 @@ radioAudio.preload = 'none';
 let radioStopping = false;
 // Pending reconnect timer for stalled streams — null when no reconnect is scheduled.
 let radioReconnectTimer: ReturnType<typeof setTimeout> | null = null;
+// Counts how many stalled-reconnects have been attempted for the current station.
+// Reset to 0 on successful playback.  Hard-stop after MAX_RADIO_RECONNECTS so a
+// dead stream doesn't loop forever and leak resources in the background.
+let radioReconnectCount = 0;
+const MAX_RADIO_RECONNECTS = 5;
 
 function clearRadioReconnectTimer() {
   if (radioReconnectTimer) { clearTimeout(radioReconnectTimer); radioReconnectTimer = null; }
@@ -211,23 +216,40 @@ function clearRadioReconnectTimer() {
 radioAudio.addEventListener('ended', () => {
   // Stream disconnected unexpectedly — clear radio state.
   clearRadioReconnectTimer();
+  radioReconnectCount = 0;
   usePlayerStore.setState({ isPlaying: false, currentRadio: null, progress: 0, currentTime: 0 });
 });
 radioAudio.addEventListener('error', () => {
   clearRadioReconnectTimer();
-  if (radioStopping) { radioStopping = false; return; }
+  if (radioStopping) { radioStopping = false; radioReconnectCount = 0; return; }
+  radioReconnectCount = 0;
   usePlayerStore.setState({ isPlaying: false, currentRadio: null });
   showToast('Radio stream error', 3000, 'error');
 });
+// Playing: stream is delivering audio — reset the reconnect counter.
+radioAudio.addEventListener('playing', () => {
+  radioReconnectCount = 0;
+});
 // Stalled: stream stopped delivering data — try to reconnect after 4 s.
+// On macOS/WKWebView, reassigning src during a stall can itself trigger
+// another stall event before the new connection is established.  The
+// radioReconnectTimer guard prevents stacking, and MAX_RADIO_RECONNECTS
+// ensures we don't loop forever on a dead stream.
 radioAudio.addEventListener('stalled', () => {
   if (radioReconnectTimer) return; // already scheduled
+  if (radioReconnectCount >= MAX_RADIO_RECONNECTS) {
+    radioReconnectCount = 0;
+    usePlayerStore.setState({ isPlaying: false, currentRadio: null });
+    showToast('Radio stream disconnected', 4000, 'error');
+    return;
+  }
   radioReconnectTimer = setTimeout(() => {
     radioReconnectTimer = null;
     if (!usePlayerStore.getState().currentRadio) return;
-    // Re-assign src to force a fresh connection, then resume playback.
+    radioReconnectCount++;
-    const src = radioAudio.src;
+    // Use load() + play() instead of src reassignment — more reliable on
-    radioAudio.src = src;
+    // macOS WKWebView where setting src can fire a premature error event.
+    radioAudio.load();
     radioAudio.play().catch(console.error);
   }, 4000);
 });
@@ -719,6 +741,7 @@ export const usePlayerStore = create<PlayerState>()(
         ++playGeneration;
         isAudioPaused = false;
         clearRadioReconnectTimer();
+        radioReconnectCount = 0;
         gaplessPreloadingId = null;
         if (seekDebounce) { clearTimeout(seekDebounce); seekDebounce = null; } seekTarget = null;
         // Stop Rust engine in case a regular track was playing.
@@ -973,7 +996,19 @@ export const usePlayerStore = create<PlayerState>()(
                       .slice(0, 10)
                       .map(t => ({ ...t, radioAdded: true as const }));
                     if (fresh.length > 0) {
-                      set(state => ({ queue: [...state.queue, ...fresh] }));
+                      // Trim played tracks from the front to keep the queue bounded.
+                      // Without trimming the queue grows unboundedly, making every
+                      // Zustand persist write larger and causing UI freezes over time.
+                      // Keep the last HISTORY_KEEP played tracks so the user can still
+                      // navigate backwards a few songs.
+                      const HISTORY_KEEP = 5;
+                      set(state => {
+                        const trimStart = Math.max(0, state.queueIndex - HISTORY_KEEP);
+                        return {
+                          queue: [...state.queue.slice(trimStart), ...fresh],
+                          queueIndex: state.queueIndex - trimStart,
+                        };
+                      });
                     }
                   })
                   .catch(() => {})
@@ -1254,7 +1289,13 @@ export const usePlayerStore = create<PlayerState>()(
         currentTrack: state.currentTrack,
         queue: state.queue,
         queueIndex: state.queueIndex,
-        currentTime: state.currentTime,
+        // currentTime is intentionally NOT persisted here.
+        // handleAudioProgress fires every 100ms and each setState with a
+        // persisted field triggers a full JSON serialisation of the queue to
+        // localStorage.  After ~10 minutes of Artist Radio the queue grows to
+        // 50+ tracks; 6 000+ synchronous SQLite writes cause WKWebView's
+        // storage process to crash on macOS → black screen + audio stop.
+        // Resume position is recovered from Subsonic savePlayQueue (5s debounce).
         lastfmLovedCache: state.lastfmLovedCache,
       }),
     }