fix: suppress stale-snapshot NP flicker during skip window on Android

Guard both snapshot-reconciliation paths (_skipping window can return the
old index before ExoPlayer commits the new one):
- onPlaybackStateChanged: skip the safety-net snapshot read while _skipping
- onPositionUpdate: reset _reconTick (defer recon) while _skipping
- _setSkipping: always reset _reconTick on every new skip/seek

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

src/player.js

@@ -160,7 +160,8 @@ window.NSPlayer = {
           navigator.mediaSession.playbackState = state.isPlaying ? 'playing' : 'paused';
         // Safety net: when playback starts, verify JS is showing the correct track.
         // Catches any edge cases where onTrackChanged was missed or queue drifted.
-        if (state.isPlaying) {
+        // Skip during _skipping window: snapshot may lag and still report the OLD index.
+        if (state.isPlaying && !_skipping) {
           try {
             const live    = JSON.parse(window.NSBridge.getState() || '{}');
             const liveIdx = live.currentIndex;
@@ -225,7 +226,9 @@ window.NSPlayer = {
     // Every 8 ticks (~2 s): verify JS track matches native snapshot.
     // Catches the gap between auto-advance and onTrackChanged arriving in JS
     // (evaluateJavascript is deferred while WebView is backgrounded/resuming).
-    if (HAS_BRIDGE && ++_reconTick >= 8) {
+    // During _skipping window snapshot is stale — reset counter and wait.
+    if (_skipping) { _reconTick = 0; }
+    else if (HAS_BRIDGE && ++_reconTick >= 8) {
       _reconTick = 0;
       try {
         const snap   = JSON.parse(window.NSBridge.getState() || '{}');
@@ -659,6 +662,7 @@ function _computeNextIdx() {
 
 function _setSkipping() {
   _skipping  = true;
+  _reconTick = 0;
   clearTimeout(_skipTimer);
   _skipTimer = setTimeout(() => { _skipping = false; }, 2000);
 }