fix: toggle PiP button closes PiP when already active

lib/services/pip_service.dart

@@ -53,6 +53,11 @@ class PipService {
     });
   }
 
+  static Future<void> exit() async {
+    if (!_isAvailable) return;
+    await _channel.invokeMethod('exit');
+  }
+
   static Future<(bool success, String? error)> enter({int? width, int? height}) async {
     if (!_isAvailable) return (false, null);
     final result = await _channel.invokeMethod<Map>('enter', {'width': width, 'height': height});

lib/services/video_pip_manager.dart

@@ -61,6 +61,12 @@ class VideoPIPManager {
     final supported = await PipService.isSupported();
     if (!supported) return (false, 'PiP not supported on this device');
 
+    // If PiP is already active, exit it
+    if (isPipActive.value) {
+      await PipService.exit();
+      return (true, null);
+    }
+
     // Reset video filter to contain mode BEFORE entering PiP (Android only —
     // iOS switches VO entirely so the filter is irrelevant)
     if (Platform.isAndroid) {

macos/Runner/MpvPlayer/MpvPlayerPlugin.swift

@@ -117,6 +117,9 @@ class MpvPlayerPlugin: NSObject, FlutterPlugin, FlutterStreamHandler, MpvPlayerD
             result(MpvPipController.isSupported)
         case "enter":
             enterPip(manual: true, result: result)
+        case "exit":
+            pipController?.stopPip()
+            result(nil)
         case "setAutoPipReady":
             if let args = call.arguments as? [String: Any], let ready = args["ready"] as? Bool {
                 autoPipEnabled = ready
@@ -171,6 +174,7 @@ class MpvPlayerPlugin: NSObject, FlutterPlugin, FlutterStreamHandler, MpvPlayerD
 
         enteredPipViaAuto = !manual
         playerCore.isPipActive = true
+
         pip.startPip(metalLayer: metalLayer, window: window, aspectRatio: aspectRatio)
         pipChannel?.invokeMethod("onPipChanged", arguments: true)
         result?(["success": true])