fix: 修复 Windows 交叉编译错误

修复内容:
- src/app/state.rs: AppState::new() 添加 current_theme 和 allow_exit 字段初始化
- src/app/commands.rs: 修复 FilePath 类型转换，使用 into_path() 方法
- src/app/mod.rs: 导入 Emitter trait 以使用 emit() 方法，修复 unused variable 警告
- src/app/mod.rs: 将主题菜单从 Menu 改为 Submenu 以符合 IsMenuItem trait
- web/src/App.tsx: 修复 invoke 类型错误，使用 as 类型断言
- web/src/pages/SettingsPage.tsx: 修复 invoke 类型错误和 modelPath 类型推断

构建结果:
- Windows 包已生成：dist/impress-asr-windows-x64-20260521_185247.zip
- 文件大小：5.0MB
- 包含 GUI 程序、CLI 工具、manifest 文件和前端资源

src/app/commands.rs

@@ -173,7 +173,9 @@ pub async fn select_model_file(app: tauri::AppHandle) -> Result<String, String>
         .add_filter("ONNX Model", &["onnx"])
         .pick_file(move |file_path| {
             let result = match file_path {
-                Some(path) => Ok(path.to_string_lossy().to_string()),
+                Some(path) => path.into_path()
+                    .map(|p| p.to_string_lossy().to_string())
+                    .map_err(|e| format!("转换路径失败：{}", e)),
                 None => Err("用户取消选择".to_string()),
             };
             let _ = tx.send(result);

src/app/mod.rs

@@ -4,9 +4,9 @@
 
 use anyhow::Result;
 use tauri::{
-    menu::{Menu, MenuItem},
+    menu::{Menu, MenuItem, Submenu},
     tray::TrayIconBuilder,
-    Manager,
+    Manager, Emitter,
 };
 use tracing::{info, warn};
 
@@ -164,7 +164,7 @@ pub fn run() -> Result<()> {
                 _ => {}
             }
         })
-        .on_page_load(|window, payload| {
+        .on_page_load(|_window, payload| {
             info!("[页面加载] URL: {}", payload.url());
             match payload.event() {
                 tauri::webview::PageLoadEvent::Started => {
@@ -266,7 +266,7 @@ fn setup_tray(app: &tauri::App) -> Result<()> {
     let theme_light = MenuItem::with_id(app, "theme_light", "浅色主题", true, None::<&str>)?;
     let theme_dark = MenuItem::with_id(app, "theme_dark", "深色主题", true, None::<&str>)?;
     let theme_system = MenuItem::with_id(app, "theme_system", "跟随系统", true, None::<&str>)?;
-    let theme_menu = Menu::with_items(app, &[&theme_light, &theme_dark, &theme_system])?;
+    let theme_submenu = Submenu::with_items(app, "主题", true, &[&theme_light, &theme_dark, &theme_system])?;
     info!("      - '主题' 子菜单已创建（浅色/深色/跟随系统）");
 
     // 完全退出选项
@@ -274,7 +274,7 @@ fn setup_tray(app: &tauri::App) -> Result<()> {
     info!("      - '完全退出' 菜单项已创建");
 
     info!("    [托盘] 组合菜单...");
-    let menu = Menu::with_items(app, &[&show, &record, &settings, &theme_menu, &quit_now])?;
+    let menu = Menu::with_items(app, &[&show, &record, &settings, &theme_submenu, &quit_now])?;
     info!("      ✓ 菜单创建成功 (5 项 + 主题子菜单)");
 
     info!("    [托盘] 加载图标...");

src/app/state.rs

@@ -59,6 +59,8 @@ impl AppState {
             current_recording_path: RwLock::new(None),
             history: RwLock::new(VecDeque::with_capacity(MAX_HISTORY)),
             current_model: RwLock::new("sensevoice-small".to_string()),
+            current_theme: RwLock::new(AppTheme::Dark),
+            allow_exit: RwLock::new(false),
         }
     }
 

web/src/App.tsx

@@ -22,9 +22,9 @@ function App() {
   useEffect(() => {
     const loadTheme = async () => {
       try {
-        const currentTheme = await window.__TAURI__.invoke<string>('get_theme')
-        setTheme(currentTheme as Theme)
-        applyTheme(currentTheme as Theme)
+        const currentTheme = await window.__TAURI__.invoke('get_theme') as Theme
+        setTheme(currentTheme)
+        applyTheme(currentTheme)
       } catch (e) {
         console.error('Failed to load theme:', e)
       }

web/src/pages/SettingsPage.tsx

@@ -78,9 +78,9 @@ export default function SettingsPage({ theme, onThemeChange }: SettingsPageProps
 
   const handleSelectModel = async () => {
     try {
-      const modelPath = await window.__TAURI__.invoke<string>('select_model_file')
+      const modelPath = await window.__TAURI__.invoke('select_model_file') as string
       if (modelPath) {
-        setSettings(prev => ({ ...prev, modelPath }))
+        setSettings(prev => ({ ...prev, modelPath: modelPath }))
         setModified(true)
       }
     } catch (e) {