Remove led_count from static, gradient, color_cycle, and effect CSS sources

These types always auto-size from the connected device — the explicit
led_count override was unused clutter. Streams now use getattr fallback.

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-v11';
+const CACHE_NAME = 'ledgrab-v12';
 
 // Only pre-cache static assets (no auth required).
 // Do NOT pre-cache '/' — it requires API key auth and would cache an error page.