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/locales/zh.json

@@ -556,6 +556,7 @@
   "dashboard.failed": "加载仪表盘失败",
   "dashboard.section.automations": "自动化",
   "dashboard.section.scenes": "场景预设",
+  "dashboard.section.sync_clocks": "同步时钟",
   "dashboard.targets": "目标",
   "dashboard.section.performance": "系统性能",
   "dashboard.perf.cpu": "CPU",