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/zh.json

@@ -1213,6 +1213,10 @@
   "targets.adaptive_fps.hint": "当设备无响应时自动降低发送速率，稳定后逐步恢复。推荐用于信号较弱的WiFi设备。",
   "targets.protocol": "协议：",
   "targets.protocol.hint": "DDP通过快速UDP发送像素（推荐）。HTTP使用JSON API——较慢但可靠，限制约500个LED。",
+  "targets.protocol.ddp": "DDP (UDP)",
+  "targets.protocol.ddp.desc": "快速UDP数据包 - 推荐",
+  "targets.protocol.http": "HTTP",
+  "targets.protocol.http.desc": "JSON API - 较慢，≤500 LED",
   "targets.protocol.serial": "串口",
   "search.open": "搜索 (Ctrl+K)",
   "search.placeholder": "搜索实体... (Ctrl+K)",