Merge pull request #2111 from heygen-com/feat/timeline-multiselect

feat(studio): timeline multi-select (marquee) + relative group time editing

packages/studio/src/contexts/TimelineEditContext.tsx

@@ -10,7 +10,7 @@ export function useTimelineEditContext(): TimelineEditCallbacks {
 }
 
 /**
- * Optional access — returns an empty object when outside a provider.
+ * Optional access, returns an empty object when outside a provider.
  * Useful in components that can render both inside and outside the NLE.
  */
 export function useTimelineEditContextOptional(): TimelineEditCallbacks {
@@ -26,12 +26,16 @@ export function TimelineEditProvider({
 }) {
   const memoized = useMemo(
     () => value,
-    // Each callback is a stable reference from the parent — memoize the bag
+    // Each callback is a stable reference from the parent, memoize the bag
     // so consumers don't re-render when unrelated parent state changes.
     // eslint-disable-next-line react-hooks/exhaustive-deps
     [
       value.onMoveElement,
       value.onResizeElement,
+      value.onMoveElements,
+      value.onResizeElements,
+      value.onPreviewMoveElements,
+      value.onPreviewResizeElements,
       value.onToggleTrackHidden,
       value.onToggleElementHidden,
       value.onBlockedEditAttempt,