feat: v0.4.0 - provider icon system, settings modal & polish

- Add provider icon system with extracted icon library (cc-switch based)

- Persist icon and icon_color in SQLite and config.toml

- Add Settings modal (theme / language / update check / silent download)

- Add useTheme and useUpdateCheck hooks

- Add provider icon picker (IconPicker) with search and grid

- Fix icon frame 2-layer color difference in ProviderEdit

- Dashboard heatmap and daily usage improvements

- Sessions page polish and adaptive layout

- Bump version to 0.4.0

package.json

@@ -1,7 +1,7 @@
 {
   "name": "kimiswitch",
   "private": true,
-  "version": "0.3.0",
+  "version": "0.4.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
@@ -15,6 +15,7 @@
   },
   "dependencies": {
     "@tauri-apps/api": "^2.0.0",
+    "@tauri-apps/plugin-opener": "^2.5.0",
     "@tauri-apps/plugin-shell": "^2.0.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"