fix: replace callback motion dot with direct WS subscription component

The previous approach (useEffect → onActiveMotionChange callback →
parent state update) was unreliable: the dot only appeared if motion
was active at the moment of initial mount but did not react to
subsequent WS motion events.

Root cause: the intermediate state chain breaks because React's
useEffect batching and component re-render timing can cause the
parent state to lag behind or miss updates when motion changes after
mount.

Fix: replace the mechanism entirely with a dedicated CameraMotionDot
component that calls useCameraActivity directly. Being a proper React
component it subscribes to the {camera}/motion WS topic via
useSyncExternalStore and re-renders immediately and reliably whenever
motion state changes — no intermediate callbacks or parent state needed.

- Remove onActiveMotionChange prop from LivePlayer; add showMotionDot
  boolean prop (default true) to suppress the internal dot in grid view
- Remove cameraMotionStates state and setCameraMotionStates from
  DraggableGridLayout
- Add CameraMotionDot component with direct useCameraActivity hook

https://claude.ai/code/session_019B4dJXtcxvHn97ZaqHUB62

web/src/components/player/LivePlayer.tsx

@@ -50,7 +50,7 @@ type LivePlayerProps = {
   showStats?: boolean;
   onStatsUpdate?: (stats: PlayerStatsType) => void;
   onLoadingChange?: (loading: boolean) => void;
-  onActiveMotionChange?: (active: boolean) => void;
+  showMotionDot?: boolean;
   onClick?: () => void;
   setFullResolution?: React.Dispatch<React.SetStateAction<VideoResolutionType>>;
   onError?: (error: LivePlayerError) => void;
@@ -78,7 +78,7 @@ export default function LivePlayer({
   showStats = false,
   onStatsUpdate,
   onLoadingChange,
-  onActiveMotionChange,
+  showMotionDot = true,
   onClick,
   setFullResolution,
   onError,
@@ -113,10 +113,8 @@ export default function LivePlayer({
 
   const onStatsUpdateRef = useRef(onStatsUpdate);
   const onLoadingChangeRef = useRef(onLoadingChange);
-  const onActiveMotionChangeRef = useRef(onActiveMotionChange);
   onStatsUpdateRef.current = onStatsUpdate;
   onLoadingChangeRef.current = onLoadingChange;
-  onActiveMotionChangeRef.current = onActiveMotionChange;
 
   useEffect(() => {
     onStatsUpdateRef.current?.(stats);
@@ -301,14 +299,6 @@ export default function LivePlayer({
     onLoadingChangeRef.current?.(loading);
   }, [cameraEnabled, offline, showStillWithoutActivity, isReEnabling, liveReady]);
 
-  // When the parent manages the dot via callback (grid view), show motion
-  // without gating on liveReady — the dot should reflect actual motion state
-  // regardless of stream load status to avoid the dot not appearing for
-  // cameras in continuous mode while the stream is reconnecting.
-  useEffect(() => {
-    onActiveMotionChangeRef.current?.(!!(autoLive && !offline && activeMotion));
-  }, [autoLive, offline, activeMotion]);
-
   if (!cameraConfig) {
     return <ActivityIndicator />;
   }
@@ -566,7 +556,7 @@ export default function LivePlayer({
             {cameraName}
           </Chip>
         )}
-        {!onActiveMotionChangeRef.current &&
+        {showMotionDot &&
           autoLive &&
           !offline &&
           activeMotion &&

web/src/views/live/DraggableGridLayout.tsx

@@ -30,6 +30,7 @@ import {
 import ActivityIndicator from "@/components/indicators/activity-indicator";
 import { PlayerStats } from "@/components/player/PlayerStats";
 import { MdCircle } from "react-icons/md";
+import { useCameraActivity } from "@/hooks/use-camera-activity";
 import { Skeleton } from "@/components/ui/skeleton";
 
 import { isEqual } from "lodash";
@@ -441,9 +442,6 @@ export default function DraggableGridLayout({
   const [cameraLoadingStates, setCameraLoadingStates] = useState<
     Record<string, boolean>
   >({});
-  const [cameraMotionStates, setCameraMotionStates] = useState<
-    Record<string, boolean>
-  >({});
   const cameraZoomViewportRefs = useRef<Record<string, HTMLDivElement | null>>(
     {},
   );
@@ -881,12 +879,7 @@ export default function DraggableGridLayout({
                             [camera.name]: loading,
                           }))
                         }
-                        onActiveMotionChange={(active) =>
+                        showMotionDot={false}
-                          setCameraMotionStates((prev) => ({
-                            ...prev,
-                            [camera.name]: active,
-                          }))
-                        }
                         onClick={() => {
                           !isEditMode && onSelectCamera(camera.name);
                         }}
@@ -918,11 +911,10 @@ export default function DraggableGridLayout({
                           minimal={true}
                         />
                       )}
-                    {cameraMotionStates[camera.name] && (
+                    <CameraMotionDot
-                      <div className="absolute right-2 top-2 z-40">
+                      camera={camera}
-                        <MdCircle className="mr-2 size-2 animate-pulse text-danger shadow-danger drop-shadow-md" />
+                      autoLive={autoLive ?? globalAutoLive}
-                      </div>
+                    />
-                    )}
                   </div>
                   {isEditMode && showCircles && <CornerCircles />}
                 </GridLiveContextMenu>
@@ -1089,6 +1081,25 @@ const BirdseyeLivePlayerGridItem = React.forwardRef<
   },
 );
 
+// Separate component so it can call useCameraActivity as a hook (no hooks in loops).
+// Direct WS subscription guarantees the dot reacts to motion changes in real-time
+// without relying on an intermediate callback → parent-state chain.
+function CameraMotionDot({
+  camera,
+  autoLive,
+}: {
+  camera: CameraConfig;
+  autoLive: boolean;
+}) {
+  const { activeMotion, offline } = useCameraActivity(camera);
+  if (!autoLive || offline || !activeMotion) return null;
+  return (
+    <div className="absolute right-2 top-2 z-40">
+      <MdCircle className="mr-2 size-2 animate-pulse text-danger shadow-danger drop-shadow-md" />
+    </div>
+  );
+}
+
 type GridLiveContextMenuProps = {
   className?: string;
   style?: React.CSSProperties;