feat: v0.5.0 - provider icon actions, duplicate & connectivity test, dashboard chart fixes

- ProviderList: icon buttons (edit/copy/test/delete) via lucide-react, speed-test badge before enable/switch button
- Duplicate provider: deep-copy provider + models as xxx-copy
- test_connectivity command (cc-switch semantics: GET base_url, any HTTP response = reachable), latency badge green/orange/red, auto-dismiss 6s
- Dashboard: daily bars anchored to panel bottom, Card flex height fix (heatmap stays content-height)

package.json

@@ -1,7 +1,7 @@
 {
   "name": "kimiswitch",
   "private": true,
-  "version": "0.4.1",
+  "version": "0.5.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
@@ -17,6 +17,7 @@
     "@tauri-apps/api": "^2.0.0",
     "@tauri-apps/plugin-opener": "^2.5.0",
     "@tauri-apps/plugin-shell": "^2.0.0",
+    "lucide-react": "^1.27.0",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },