fix(studio): keep gsapAnimations in sync with the keyframe cache

An ungrouped tween (mixed property groups classify to propertyGroup
undefined) fed keyframeCache but was skipped by every gsapAnimations
writer, so the collapsed row drew diamonds the expanded lanes had no
source animation to render. Drop the property-group gate at all three
writers; lane consumers already filter by group.

Also route the same-percentage merge in updateKeyframeCacheFromParsed
through deduplicateKeyframes so the easeAmbiguous rule has one owner.

packages/studio/src/hooks/useGsapTweenCache.ts

@@ -329,9 +329,9 @@ export function useGsapAnimationsForElement(
   // fallow-ignore-next-line complexity
   useEffect(() => {
     if (!elementId) return;
+    // No property-group filter: ungrouped tweens are recorded here as well.
     const sourceAnimations = animations.filter(
-      (animation) =>
-        animation.propertyGroup && (animation.keyframes || synthesizeFlatTweenKeyframes(animation)),
+      (animation) => animation.keyframes || synthesizeFlatTweenKeyframes(animation),
     );
     if (sourceAnimations.length > 0)
       writeGsapAnimationsForElement(sourceFile, elementId, sourceAnimations);
@@ -493,10 +493,10 @@ export function usePopulateKeyframeCacheForFile(
         // group / descendant selectors, not just `#id`).
         for (const id of resolveSelectorElementIds(anim.targetSelector, doc)) {
           // kfData is already resolved (real keyframes OR a synthesized flat
-          // tween), so a grouped flat tween joins the store like a keyframed one.
-          if (anim.propertyGroup) {
-            sourceByElement.set(id, [...(sourceByElement.get(id) ?? []), anim]);
-          }
+          // tween), so a flat tween joins the store like a keyframed one. No
+          // property-group filter: this map must cover every tween the cache
+          // below records, or expanded lanes have nothing to render.
+          sourceByElement.set(id, [...(sourceByElement.get(id) ?? []), anim]);
           const { elStart, elDuration } = resolveClipTimingBasis(id, sf, elements, domClipChildren);
           const clipKeyframes = kfData.keyframes.map((kf) => {
             const absTime = toAbsoluteTime(tweenPos, tweenDur, kf.percentage);