fix: convert absolute pause position to buffer-relative on resume after seek-beyond-buffer

DeepDrftPublic/Interop/audio/AudioPlayer.ts

@@ -227,8 +227,10 @@ export class AudioPlayer {
             this.isPlaying = true;
             this.isPaused = false;
 
-            // Resume from pause position
-            this.scheduler.playFromPosition(this.pausePosition);
+            // Resume from pause position. pausePosition is absolute track time;
+            // playFromPosition expects a buffer-relative position (excludes playbackOffset).
+            const bufferRelativePosition = this.pausePosition - this.scheduler.getPlaybackOffset();
+            this.scheduler.playFromPosition(Math.max(0, bufferRelativePosition));
             this.startProgressTracking();
 
             return { success: true };

DeepDrftPublic/Interop/audio/PlaybackScheduler.ts

@@ -235,7 +235,9 @@ export class PlaybackScheduler {
         const position = this.getCurrentPosition();
         this.isActive_ = false;  // Prevent handleSourceEnded from scheduling more
         this.stopAllSources();
-        this.playbackAnchorPosition = position;
+        // getCurrentPosition() returns absolute time (anchor + playbackOffset); the anchor
+        // is buffer-relative, so strip the offset back out before storing it.
+        this.playbackAnchorPosition = position - this.playbackOffset;
         this.playbackAnchorTime = 0;
         this.nextScheduleTime = 0;
         return position;