Apply IconSelect to all type selectors across the app

- Value source type (5 types, static icons)
- Device type (7 types, new wifi/usb icon paths + device icon map)
- Capture engine (dynamic from API, uses getEngineIcon)
- Audio engine (dynamic from API, new getAudioEngineIcon)
- Add i18n description keys for value source and device types
- Fix trigger button styling to match native input height

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-v15';
+const CACHE_NAME = 'ledgrab-v16';
 
 // Only pre-cache static assets (no auth required).
 // Do NOT pre-cache '/' — it requires API key auth and would cache an error page.