fix: 增强错误处理，确保异常情况下也能显示页面

后端变更:
- src/app/mod.rs: 窗口 hide() 使用 _ 忽略错误，避免 unwrap() panic

前端变更:
- web/src/components/ErrorBoundary.tsx: 新增错误边界组件，捕获未处理的错误
- web/src/main.tsx: 使用 ErrorBoundary 包裹 App 组件
- web/src/App.tsx: 优化主题加载和监听器的错误处理，确保失败时使用默认主题

错误处理能力:
- 即使 Tauri 命令失败，页面也能正常显示
- 未捕获错误会显示友好的错误页面，提供刷新按钮
- 主题加载失败时自动使用 system 主题降级
- 事件监听器清理更安全，避免异步问题

构建结果:
- Windows 包：dist/impress-asr-windows-x64-20260521_190528.zip
- 文件大小：5.0MB

src/app/mod.rs

@@ -151,7 +151,7 @@ pub fn run() -> Result<()> {
                 tauri::WindowEvent::CloseRequested { api, .. } => {
                     info!("  [窗口] 关闭请求 - 隐藏窗口到托盘");
                     // 隐藏窗口而不是关闭
-                    window.hide().unwrap();
+                    let _ = window.hide();
                     api.prevent_close();
                 }
                 tauri::WindowEvent::Focused(focused) => {

web/src/App.tsx

@@ -27,19 +27,28 @@ function App() {
         applyTheme(currentTheme)
       } catch (e) {
         console.error('Failed to load theme:', e)
+        // 使用默认主题，不影响页面显示
+        applyTheme('system')
       }
     }
     loadTheme()
 
     // 监听主题变化事件
-    const unlisten = window.__TAURI__.listen('theme-change', (event) => {
+    let unlistenFn: (() => void) | null = null
+    window.__TAURI__.listen('theme-change', (event) => {
       const newTheme = event.payload as string
       setTheme(newTheme as Theme)
       applyTheme(newTheme as Theme)
+    }).then(fn => {
+      unlistenFn = fn
+    }).catch(e => {
+      console.error('Failed to setup theme listener:', e)
     })
 
     return () => {
-      unlisten.then(fn => fn())
+      if (unlistenFn) {
+        unlistenFn()
+      }
     }
   }, [])
 

web/src/components/ErrorBoundary.tsx

@@ -0,0 +1,89 @@
+import { Component, ErrorInfo, ReactNode } from 'react'
+
+interface Props {
+  children: ReactNode
+  fallback?: ReactNode
+}
+
+interface State {
+  hasError: boolean
+  error: Error | null
+}
+
+export class ErrorBoundary extends Component<Props, State> {
+  public state: State = {
+    hasError: false,
+    error: null
+  }
+
+  public static getDerivedStateFromError(error: Error): State {
+    return { hasError: true, error }
+  }
+
+  public componentDidCatch(error: Error, errorInfo: ErrorInfo): void {
+    console.error('ErrorBoundary caught an error:', error, errorInfo)
+  }
+
+  public render(): ReactNode {
+    if (this.state.hasError) {
+      if (this.props.fallback) {
+        return this.props.fallback
+      }
+
+      return (
+        <div style={{
+          padding: '40px',
+          textAlign: 'center',
+          color: 'var(--text-secondary)',
+          maxWidth: '600px',
+          margin: '40px auto'
+        }}>
+          <h2 style={{ fontSize: '20px', marginBottom: '16px', color: 'var(--text-primary)' }}>
+            发生错误
+          </h2>
+          <p style={{ marginBottom: '24px' }}>
+            抱歉，页面加载时出现问题。请尝试刷新页面或重启应用。
+          </p>
+          {this.state.error && (
+            <details style={{
+              textAlign: 'left',
+              background: 'var(--bg-tertiary)',
+              padding: '16px',
+              borderRadius: '8px',
+              fontSize: '12px',
+              fontFamily: 'monospace',
+              whiteSpace: 'pre-wrap',
+              wordBreak: 'break-all',
+              maxHeight: '300px',
+              overflow: 'auto'
+            }}>
+              <summary style={{ cursor: 'pointer', marginBottom: '8px' }}>
+                错误详情（点击展开）
+              </summary>
+              {this.state.error.toString()}
+            </details>
+          )}
+          <button
+            onClick={() => window.location.reload()}
+            style={{
+              marginTop: '20px',
+              padding: '12px 24px',
+              background: 'var(--accent)',
+              color: 'white',
+              border: 'none',
+              borderRadius: '8px',
+              cursor: 'pointer',
+              fontSize: '14px'
+            }}
+          >
+            刷新页面
+          </button>
+        </div>
+      )
+    }
+
+    return this.props.children
+  }
+}
+
+export default ErrorBoundary

web/src/main.tsx

@@ -1,10 +1,13 @@
 import React from 'react'
 import ReactDOM from 'react-dom/client'
 import App from './App'
+import ErrorBoundary from './components/ErrorBoundary'
 import './index.css'
 
 ReactDOM.createRoot(document.getElementById('root') as HTMLElement).render(
   <React.StrictMode>
+    <ErrorBoundary>
       <App />
+    </ErrorBoundary>
   </React.StrictMode>,
 )