fix: never rebuild native queue in onReady while ExoPlayer is playing

When onReady fires during MediaController reconnect (fragment navigation,
activity resume), calling setQueue restarts the current song from pos 0.
Guard: if native isPlaying=true, only re-sync JS UI — never touch the queue.
Only push a new queue when native is idle/empty (cold start).

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

src/player.js

@@ -79,18 +79,29 @@ window.NSPlayer = {
       try {
         const raw = window.NSBridge.getState();
         const state = raw ? (JSON.parse(raw) || {}) : {};
-        const nativeLen = state.queueLength || 0;
+        const nativeLen   = state.queueLength || 0;
-        if (nativeLen > 0 && nativeLen === S.queue.length) {
+        const nativePlaying = state.isPlaying || false;
-          // Native still has the same queue — just re-sync UI state.
+        if (nativeLen > 0 && nativePlaying) {
+          // Native is actively playing — never rebuild the queue, it would restart the song.
+          // Just re-sync JS state and UI from whatever native reports.
           S.qIdx         = state.currentIndex ?? S.qIdx;
-          _nativePlaying = state.isPlaying    || false;
+          _nativePlaying = nativePlaying;
           _nativePos     = state.positionMs   || 0;
           const s = S.queue[S.qIdx];
           if (s) { updatePlayerUI(s, true); onNpSongChange(s.id); }
           setPlayIcon(_nativePlaying);
           renderQueue();
-        } else {
+        } else if (nativeLen > 0 && nativeLen === S.queue.length) {
-          // Native queue is empty or stale — push JS state (restored from localStorage).
+          // Paused but queue matches — re-sync UI state only.
+          S.qIdx         = state.currentIndex ?? S.qIdx;
+          _nativePlaying = false;
+          _nativePos     = state.positionMs   || 0;
+          const s = S.queue[S.qIdx];
+          if (s) { updatePlayerUI(s, true); onNpSongChange(s.id); }
+          setPlayIcon(false);
+          renderQueue();
+        } else if (!nativePlaying) {
+          // Native is idle/empty — safe to push JS state (e.g. after cold start).
           window.NSBridge.setQueue(JSON.stringify(buildTrackList()), S.qIdx, false);
         }
       } catch (e) {}