Add sync clock cards to dashboard and match FPS chart colors

Sync clocks now appear as compact cards on the dashboard with
pause/resume/reset controls and click-to-navigate. Dashboard FPS
sparkline charts use the same blue/green colors as target card charts.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/sw.js

@@ -7,7 +7,7 @@
  *   - Navigation: network-first with offline fallback
  */
 
-const CACHE_NAME = 'ledgrab-v8';
+const CACHE_NAME = 'ledgrab-v9';
 
 // Only pre-cache static assets (no auth required).
 // Do NOT pre-cache '/' — it requires API key auth and would cache an error page.