feat: add config directory override support for WSL

- Add persistent app settings with custom Claude Code and Codex config directories
- Add config directory override UI in settings modal with manual input, browse, and reset options
- Integrate tauri-plugin-dialog for native directory picker
- Support WSL and other special environments where config paths need manual specification

Changes:
- settings.rs: Implement settings load/save and directory override logic
- SettingsModal: Add config directory override UI components
- API: Add get_config_dir and pick_directory commands

src-tauri/src/commands.rs

@@ -3,14 +3,14 @@
 use std::collections::HashMap;
 use tauri::State;
 use tauri_plugin_opener::OpenerExt;
+use tauri_plugin_dialog::DialogExt;
 
 use crate::app_config::AppType;
 use crate::codex_config;
-use crate::config::{get_claude_settings_path, ConfigStatus};
-use crate::vscode;
-use crate::config;
+use crate::config::{self, get_claude_settings_path, ConfigStatus};
 use crate::provider::Provider;
 use crate::store::AppState;
+use crate::vscode;
 
 fn validate_provider_settings(app_type: &AppType, provider: &Provider) -> Result<(), String> {
     match app_type {
@@ -520,6 +520,26 @@ pub async fn get_claude_code_config_path() -> Result<String, String> {
     Ok(get_claude_settings_path().to_string_lossy().to_string())
 }
 
+/// 获取当前生效的配置目录
+#[tauri::command]
+pub async fn get_config_dir(
+    app_type: Option<AppType>,
+    app: Option<String>,
+    appType: Option<String>,
+) -> Result<String, String> {
+    let app = app_type
+        .or_else(|| app.as_deref().map(|s| s.into()))
+        .or_else(|| appType.as_deref().map(|s| s.into()))
+        .unwrap_or(AppType::Claude);
+
+    let dir = match app {
+        AppType::Claude => config::get_claude_config_dir(),
+        AppType::Codex => codex_config::get_codex_config_dir(),
+    };
+
+    Ok(dir.to_string_lossy().to_string())
+}
+
 /// 打开配置文件夹
 /// 兼容两种参数：`app_type`（推荐）或 `app`（字符串）
 #[tauri::command]
@@ -553,6 +573,38 @@ pub async fn open_config_folder(
     Ok(true)
 }
 
+/// 弹出系统目录选择器并返回用户选择的路径
+#[tauri::command]
+pub async fn pick_directory(
+    app: tauri::AppHandle,
+    default_path: Option<String>,
+) -> Result<Option<String>, String> {
+    let initial = default_path
+        .map(|p| p.trim().to_string())
+        .filter(|p| !p.is_empty());
+
+    let result = tauri::async_runtime::spawn_blocking(move || {
+        let mut builder = app.dialog().file();
+        if let Some(path) = initial {
+            builder = builder.set_directory(path);
+        }
+        builder.blocking_pick_folder()
+    })
+    .await
+    .map_err(|e| format!("弹出目录选择器失败: {}", e))?;
+
+    match result {
+        Some(file_path) => {
+            let resolved = file_path
+                .simplified()
+                .into_path()
+                .map_err(|e| format!("解析选择的目录失败: {}", e))?;
+            Ok(Some(resolved.to_string_lossy().to_string()))
+        }
+        None => Ok(None),
+    }
+}
+
 /// 打开外部链接
 #[tauri::command]
 pub async fn open_external(app: tauri::AppHandle, url: String) -> Result<bool, String> {
@@ -603,21 +655,15 @@ pub async fn open_app_config_folder(handle: tauri::AppHandle) -> Result<bool, St
 
 /// 获取设置
 #[tauri::command]
-pub async fn get_settings(_state: State<'_, AppState>) -> Result<serde_json::Value, String> {
-    // 暂时返回默认设置：系统托盘（菜单栏）显示开关
-    Ok(serde_json::json!({
-        "showInTray": true
-    }))
+pub async fn get_settings() -> Result<serde_json::Value, String> {
+    serde_json::to_value(crate::settings::get_settings())
+        .map_err(|e| format!("序列化设置失败: {}", e))
 }
 
 /// 保存设置
 #[tauri::command]
-pub async fn save_settings(
-    _state: State<'_, AppState>,
-    settings: serde_json::Value,
-) -> Result<bool, String> {
-    // TODO: 实现系统托盘显示开关的保存与应用（显示/隐藏菜单栏托盘图标）
-    log::info!("保存设置: {:?}", settings);
+pub async fn save_settings(settings: crate::settings::AppSettings) -> Result<bool, String> {
+    crate::settings::update_settings(settings)?;
     Ok(true)
 }