feat(webui): add dedicated CAMERAS tab group for camera viewer (Issue #349)

Move camera viewer from TELEMETRY to new CAMERAS tab group (rose color).
Reorganizes tab structure to separate media capture from system telemetry.
CameraViewer.jsx already provides comprehensive MJPEG stream support:
- Multi-camera switching (7 total: front/left/rear/right CSI, D435i RGB/depth, panoramic)
- FPS counter per camera with quality badge (FULL/GOOD/LOW/NO SIGNAL)
- Resolution and camera info display
- Detection overlays (faces, gestures, scene objects)
- Picture-in-picture support (up to 3 pinned cameras)
- Video recording (MP4/WebM) and snapshot capture
- 360° panoramic viewer with mouse drag pan
- Color-coded quality indicators based on FPS

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

ui/social-bot/src/App.jsx

@@ -112,7 +112,13 @@ const TAB_GROUPS = [
       { id: 'map',     label: 'Map',     },
       { id: 'control', label: 'Control', },
       { id: 'health',  label: 'Health',  },
-      { id: 'cameras', label: 'Cameras', },
+    ],
+  },
+  {
+    label: 'CAMERAS',
+    color: 'text-rose-600',
+    tabs: [
+      { id: 'cameras', label: 'Cameras' },
     ],
   },
   {