Add IconSelect grids for animation type and protocol selectors

Replace plain dropdowns with visual icon grids:
- Animation type (static/gradient CSS sources): icons for each effect
- WLED target protocol: DDP vs HTTP with descriptions
Add i18n keys for protocol options in all 3 locales.

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

server/src/wled_controller/static/locales/en.json

@@ -1213,6 +1213,10 @@
   "targets.adaptive_fps.hint": "Automatically reduce send rate when the device becomes unresponsive, and gradually recover when it stabilizes. Recommended for WiFi devices with weak signal.",
   "targets.protocol": "Protocol:",
   "targets.protocol.hint": "DDP sends pixels via fast UDP (recommended for most setups). HTTP uses the JSON API — slower but reliable, limited to ~500 LEDs.",
+  "targets.protocol.ddp": "DDP (UDP)",
+  "targets.protocol.ddp.desc": "Fast raw UDP packets — recommended",
+  "targets.protocol.http": "HTTP",
+  "targets.protocol.http.desc": "JSON API — slower, ≤500 LEDs",
   "targets.protocol.serial": "Serial",
   "search.open": "Search (Ctrl+K)",
   "search.placeholder": "Search entities... (Ctrl+K)",