feat: session manger (#867)

* feat: init session manger

* feat: persist selected app to localStorage

- Save app selection when switching providers
- Restore last selected app on page load

* feat: persist current view to localStorage

- Save view selection when switching tabs
- Restore last selected view on page load

* styles: update ui

* feat: Improve macOS Terminal activation and refactor Kitty launch to use  command with user's default shell.

* fix: session view

* feat: toc

* feat: Implement FlexSearch for improved session search functionality.

* feat: Redesign session manager search and filter UI for a more compact and dynamic experience.

* refactor: modularize session manager by extracting components and utility functions into dedicated files.

* feat: Enhance session terminal launching with support for iTerm2, Ghostty, WezTerm, and Alacritty, including UI and custom configuration options.

* feat: Conditionally render terminal selection and resume session buttons only on macOS.

src/types.ts

@@ -213,6 +213,24 @@ export interface Settings {
   preferredTerminal?: string;
 }
 
+export interface SessionMeta {
+  providerId: string;
+  sessionId: string;
+  title?: string;
+  summary?: string;
+  projectDir?: string | null;
+  createdAt?: number;
+  lastActiveAt?: number;
+  sourcePath?: string;
+  resumeCommand?: string;
+}
+
+export interface SessionMessage {
+  role: string;
+  content: string;
+  ts?: number;
+}
+
 // MCP 服务器连接参数（宽松：允许扩展字段）
 export interface McpServerSpec {
   // 可选：社区常见 .mcp.json 中 stdio 配置可不写 type