feat: toolbar auto-hides after 60s of no interaction

Sources/MiniPlayerApp.swift

@@ -202,6 +202,11 @@ struct ControlToolbar: View {
         .padding(.horizontal, 16)
         .padding(.vertical, 8)
         .background(.black.opacity(0.55))
+        .onHover { hovering in
+            bridge.isInteracting = hovering
+            if hovering { bridge.recordInteraction() }
+        }
+        .onTapGesture { bridge.recordInteraction() }
     }
 }
 

Sources/PlayerBridge.swift

@@ -330,6 +330,10 @@ final class PlayerBridge: ObservableObject {
     
     // MARK: - 播放列表窗口
     @Published var showPlaylistSheet = false
+    @Published var lastInteraction = Date()
+    @Published var isInteracting = false
+    
+    func recordInteraction() { lastInteraction = Date() }
     
     func togglePlaylistWindow() {
         #if os(macOS)