fix(studio): harden keyframe editing semantics

packages/studio/src/hooks/useGsapKeyframeOps.ts

@@ -236,7 +236,7 @@ export function useGsapKeyframeOps({
   );
 
   const moveKeyframe = useCallback(
-    (
+    async (
       selection: DomEditSelection,
       animationId: string,
       fromPercentage: number,
@@ -247,18 +247,26 @@ export function useGsapKeyframeOps({
       // updateKeyframeCacheFromParsed re-keys the diamond from the fresh parse, so no
       // optimistic cache write is needed (mapping the tween-% to clip-% here would
       // duplicate that math). softReload mirrors remove-keyframe.
-      void commitMutation(selection, mutation, {
-        label: `Move keyframe to ${toPercentage}%`,
-        softReload: true,
-      }).catch((error) => {
+      try {
+        let changed = false;
+        await commitMutation(selection, mutation, {
+          label: `Move keyframe to ${toPercentage}%`,
+          softReload: true,
+          onResult: (result) => {
+            changed = result.changed !== false;
+          },
+        });
+        return changed;
+      } catch (error) {
         trackGsapSaveFailure(error, selection, mutation, `Move keyframe to ${toPercentage}%`);
-      });
+        return false;
+      }
     },
     [commitMutation, trackGsapSaveFailure],
   );
 
   const resizeKeyframedTween = useCallback(
-    (
+    async (
       selection: DomEditSelection,
       animationId: string,
       position: number,
@@ -275,12 +283,20 @@ export function useGsapKeyframeOps({
       // Boundary drag-to-retime: the server re-keys keyframes in place + grows the
       // tween window, preserving _auto / per-keyframe ease / easeEach / outer ease.
       // softReload re-keys the diamonds from the fresh parse (mirrors moveKeyframe).
-      void commitMutation(selection, mutation, {
-        label: "Retime keyframe (resize tween)",
-        softReload: true,
-      }).catch((error) => {
+      try {
+        let changed = false;
+        await commitMutation(selection, mutation, {
+          label: "Retime keyframe (resize tween)",
+          softReload: true,
+          onResult: (result) => {
+            changed = result.changed !== false;
+          },
+        });
+        return changed;
+      } catch (error) {
         trackGsapSaveFailure(error, selection, mutation, "Retime keyframe (resize tween)");
-      });
+        return false;
+      }
     },
     [commitMutation, trackGsapSaveFailure],
   );