feat: fullscreen video + click icon to toggle control toolbar

- Video fills entire window via VideoPlayerRepresentable
- MiniPlayerIcon in top-left corner toggles ControlToolbar visibility
- ControlToolbar slides up from bottom with animation
- Removed Bricks JSON UI dependency for main view
- All toolbar features preserved: open/prev/play/next/volume/tracks/repeat/fullscreen/playlist

Sources/MiniPlayerApp.swift

@@ -129,23 +129,37 @@ struct MiniPlayerApp: App {
 struct BricksAppView: View {
     @ObservedObject var bridge: PlayerBridge
     @ObservedObject var engine: BricksEngine
-    @State private var jsonString: String?
+    @State private var showToolbar = false
+    @State private var isHoveringIcon = false
     
     var body: some View {
         ZStack(alignment: .topLeading) {
-            if let json = jsonString {
-                BricksView(json: json, engine: engine)
-            } else {
-                ProgressView("Loading UI...")
-                    .task {
-                        jsonString = loadJSONString()
-                    }
-            }
+            // 视频占满全屏
+            VideoPlayerRepresentable(player: bridge.player)
+                .ignoresSafeArea()
             
-            // 左上角应用图标
+            // 左上角应用图标 — 点击切换控制栏
             MiniPlayerIcon()
                 .frame(width: 32, height: 32)
                 .padding(12)
+                .opacity(isHoveringIcon ? 1.0 : 0.6)
+                .onHover { isHoveringIcon = $0 }
+                .onTapGesture {
+                    withAnimation(.easeInOut(duration: 0.25)) {
+                        showToolbar.toggle()
+                    }
+                }
+            
+            // 底部控制栏 — 点击图标显示/隐藏
+            VStack {
+                Spacer()
+                if showToolbar {
+                    ControlToolbar(bridge: bridge, isHovering: .constant(false)) {
+                        // onTouch: 保持显示
+                    }
+                    .transition(.move(edge: .bottom).combined(with: .opacity))
+                }
+            }
         }
         .sheet(isPresented: $bridge.showURLDialog) {
             URLInputDialog(bridge: bridge)
@@ -157,20 +171,6 @@ struct BricksAppView: View {
             PlaylistWindowView(bridge: bridge)
         }
     }
-    
-    private func loadJSONString() -> String {
-        // 从 Resources 加载 miniplayer.ui
-        if let url = Bundle.module.url(forResource: "miniplayer", withExtension: "ui"),
-           let data = try? Data(contentsOf: url),
-           let str = String(data: data, encoding: .utf8) {
-            return str
-        }
-        
-        // Fallback: 最小化 schema
-        return """
-        {"widgettype":"VBox","options":{"width":"100%","height":"100%"},"subwidgets":[{"widgettype":"Text","options":{"text":"Failed to load UI schema"}}]}
-        """
-    }
 }