Prevent starting PiP from mini player bar while player window is open

Tapping the mini bar video thumbnail (with tap action set to PiP) or its
PiP button while the expanded player window was open started PiP playing
alongside the window. Bring the player window to the front instead when
it is open or opening.

Yattee/Views/Player/MiniPlayerView.swift

@@ -80,6 +80,13 @@ struct MiniPlayerView: View {
     /// Handle tap on video preview - action based on settings (PiP or expand)
     /// When video is disabled, always expand player since PiP needs the video view mounted
     private func handleVideoPreviewTap() {
+        // Don't start PiP while the expanded player is open (or opening) — PiP
+        // would play alongside the player window. Bring the window forward instead.
+        if let nav = navigationCoordinator, nav.isPlayerExpanded || nav.isPlayerExpanding {
+            nav.expandPlayer()
+            return
+        }
+
         // If video is disabled in mini player, always expand (can't start PiP without video view)
         guard miniPlayerSettings.showVideo else {
             navigationCoordinator?.expandPlayer()
@@ -560,6 +567,12 @@ struct MiniPlayerView: View {
     private func pipButton(config: ControlButtonConfiguration) -> some View {
         Button {
             incrementTapCount(for: config)
+            // Don't start PiP while the expanded player is open (or opening) — PiP
+            // would play alongside the player window. Bring the window forward instead.
+            if let nav = navigationCoordinator, nav.isPlayerExpanded || nav.isPlayerExpanding {
+                nav.expandPlayer()
+                return
+            }
             if let backend = playerService?.currentBackend as? MPVBackend {
                 backend.startPiP()
             }