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

pnpm-lock.yaml

@@ -26,6 +26,9 @@ importers:
       '@tauri-apps/api':
         specifier: ^2.8.0
         version: 2.8.0
+      '@tauri-apps/plugin-dialog':
+        specifier: ^2.4.0
+        version: 2.4.0
       '@tauri-apps/plugin-process':
         specifier: ^2.0.0
         version: 2.3.0
@@ -635,6 +638,9 @@ packages:
     engines: {node: '>= 10'}
     hasBin: true
 
+  '@tauri-apps/plugin-dialog@2.4.0':
+    resolution: {integrity: sha512-OvXkrEBfWwtd8tzVCEXIvRfNEX87qs2jv6SqmVPiHcJjBhSF/GUvjqUNIDmKByb5N8nvDqVUM7+g1sXwdC/S9w==}
+
   '@tauri-apps/plugin-process@2.3.0':
     resolution: {integrity: sha512-0DNj6u+9csODiV4seSxxRbnLpeGYdojlcctCuLOCgpH9X3+ckVZIEj6H7tRQ7zqWr7kSTEWnrxtAdBb0FbtrmQ==}
 
@@ -1445,6 +1451,10 @@ snapshots:
       '@tauri-apps/cli-win32-ia32-msvc': 2.8.1
       '@tauri-apps/cli-win32-x64-msvc': 2.8.1
 
+  '@tauri-apps/plugin-dialog@2.4.0':
+    dependencies:
+      '@tauri-apps/api': 2.8.0
+
   '@tauri-apps/plugin-process@2.3.0':
     dependencies:
       '@tauri-apps/api': 2.8.0