fix(video): release scrub chrome hold

close #1340

lib/widgets/video_controls/parts/playback_input.dart

@@ -89,9 +89,6 @@ extension _PlexVideoControlsPlaybackInputMethods on _PlexVideoControlsState {
 
   /// Throttled seek for timeline slider - executes immediately then throttles to 200ms
   void _throttledSeek(Duration position) {
-    // Hold before the transcoding early-return so a slow scrub never loses
-    // the controls to auto-hide mid-drag (idempotent while held).
-    widget.chromeController.hold(PlayerChromeHold.scrub);
     if (widget.isTranscoding) return;
     _seekThrottle([position]);
   }
@@ -100,6 +97,13 @@ extension _PlexVideoControlsPlaybackInputMethods on _PlexVideoControlsState {
   void _finalizeSeek(Duration position) {
     _seekThrottle.cancel();
     unawaited(_seekToPosition(position));
+  }
+
+  void _holdTimelineScrub() {
+    widget.chromeController.hold(PlayerChromeHold.scrub);
+  }
+
+  void _releaseTimelineScrub() {
     widget.chromeController.release(PlayerChromeHold.scrub);
   }