chore: migrate contexts to stores and refresh barrel exports

- Move state management from `src/contexts` to `src/stores` (zustand-based)
- Update barrelsby config to include new stores directory
- Add bottom-sheet and auth-background components
- Auto-open browser on dev server ready in VS Code launch config
- Refresh generated barrel index files

src/app/chat/components/index.ts

@@ -1,35 +1,5 @@
 /**
- * Chat 公共组件导出
+ * @file Automatically generated by barrelsby.
  */
 
-// 屏幕 + 顶层
-export { ChatScreen } from "./chat-screen";
-
-// 顶部
-export { ChatHeader } from "./chat-header";
-
-// 消息区
-export { ChatArea } from "./chat-area";
-
-// 输入栏
-export { ChatInputBar } from "./chat-input-bar";
-export { ChatInputTextField } from "./chat-input-text-field";
-export { ChatSendButton } from "./chat-send-button";
-
-// 消息气泡
-export { MessageBubble } from "./message-bubble";
-export { MessageContent } from "./message-content";
-export { MessageAvatar } from "./message-avatar";
-export { TextBubble } from "./text-bubble";
-export { ImageBubble } from "./image-bubble";
-export { LottieMessageBubble } from "./lottie-message-bubble";
-export { DateHeader } from "./date-header";
-export { FullscreenImageViewer } from "./fullscreen-image-viewer";
-
-// 弹窗 / 浮层 / 卡片
-export { QuotaDialog } from "./quota-dialog";
-export { PwaInstallDialog } from "./pwa-install-dialog";
-export { PwaInstallOverlay } from "./pwa-install-overlay";
-export { BrowserHintOverlay } from "./browser-hint-overlay";
-export { AiDisclosureBanner } from "./ai-disclosure-banner";
-export { LanguageDialog, DEFAULT_LANGUAGES } from "./language-dialog";
+export * from "./index";