Improve motion review and add motion search (#22253)

* implement motion search and motion previews

* tweaks

* fix merge issue

* fix copilot instructions

web/src/components/timeline/MotionReviewTimeline.tsx

@@ -25,6 +25,7 @@ export type MotionReviewTimelineProps = {
   timestampSpread: number;
   timelineStart: number;
   timelineEnd: number;
+  scrollToTime?: number;
   showHandlebar?: boolean;
   handlebarTime?: number;
   setHandlebarTime?: React.Dispatch<React.SetStateAction<number>>;
@@ -58,6 +59,7 @@ export function MotionReviewTimeline({
   timestampSpread,
   timelineStart,
   timelineEnd,
+  scrollToTime,
   showHandlebar = false,
   handlebarTime,
   setHandlebarTime,
@@ -176,6 +178,15 @@ export function MotionReviewTimeline({
     [],
   );
 
+  // allow callers to request the timeline center on a specific time
+  useEffect(() => {
+    if (scrollToTime == undefined) return;
+
+    setTimeout(() => {
+      scrollToSegment(alignStartDateToTimeline(scrollToTime), true, "auto");
+    }, 0);
+  }, [scrollToTime, scrollToSegment, alignStartDateToTimeline]);
+
   // keep handlebar centered when zooming
   useEffect(() => {
     setTimeout(() => {

web/src/components/timeline/ReviewTimeline.tsx

@@ -343,9 +343,12 @@ export function ReviewTimeline({
 
   useEffect(() => {
     if (onHandlebarDraggingChange) {
-      onHandlebarDraggingChange(isDraggingHandlebar);
+      // Keep existing callback name but treat it as a generic dragging signal.
+      // This allows consumers (e.g. export-handle timelines) to correctly
+      // enable preview scrubbing while dragging export handles.
+      onHandlebarDraggingChange(isDragging);
     }
-  }, [isDraggingHandlebar, onHandlebarDraggingChange]);
+  }, [isDragging, onHandlebarDraggingChange]);
 
   const isHandlebarInNoRecordingPeriod = useMemo(() => {
     if (!getRecordingAvailability || handlebarTime === undefined) return false;