feat: add common config snippet management system

- Add settings module for managing common configuration snippets
- Implement UI for creating, editing, and deleting snippets
- Add tauri-plugin-fs for file operations
- Replace co-authored setting with flexible snippet system
- Enable users to define custom config snippets for frequently used settings

src-tauri/capabilities/default.json

@@ -8,6 +8,7 @@
   "permissions": [
     "core:default",
     "opener:default",
+    "dialog:default",
     "updater:default",
     "process:allow-restart"
   ]