fix(studio): per-property-group intercept routing + drag/resize fixes (#1356)

* fix(core): per-property-group keyframe foundations

Add PropertyGroupName type system (position/scale/size/rotation/visual/other),
PROPERTY_GROUPS constant, classifyPropertyGroup/classifyTweenPropertyGroup
functions. Parser generates group-aware animation IDs, resolves position strings
(+=, -=, <, >), uses numeric matching with 2% tolerance, and preserves IDs
across all mutations.

* fix(core): add split-into-property-groups and replace-with-keyframes mutations

Server-side mutations for atomic property-group splitting and keyframe
replacement. Client commitMutation returns early on changed:false instead
of throwing.

* fix(studio): per-property-group intercept routing + drag/resize fixes

Rewire GSAP runtime bridge for property-group routing: drag sends only {x,y}
to position group, resize routes to scale group via data-hf-studio-original-width,
rotation routes to rotation group. Add resolveGroupTween helper, from-extend
with split-first-then-position-only pattern, autoKeyframeEnabled guards,
GSAP base + delta fix in drag draft, cancel-restores-GSAP-x/y from data attrs.

packages/studio/src/hooks/useEnableKeyframes.ts

@@ -52,10 +52,12 @@ function readElementPosition(
   const element = sel.element;
   if (!element?.isConnected || !gsap?.getProperty) return result;
 
+  const POSITION_PROPS = new Set(["x", "y", "xPercent", "yPercent"]);
   const props = anim ? Object.keys(anim.properties) : ["x", "y", "opacity"];
   for (const prop of props) {
     const val = Number(gsap.getProperty(element, prop));
-    if (Number.isFinite(val)) result[prop] = Math.round(val);
+    if (!Number.isFinite(val)) continue;
+    result[prop] = POSITION_PROPS.has(prop) ? Math.round(val) : Math.round(val * 1000) / 1000;
   }
 
   return result;