feat(studio): GSAP tween editing in Design panel (#1102)

* feat(studio): GSAP tween editing in Design panel

Add a GSAP animation editor to the studio Design panel: select an element,
view and edit its tweens (properties, easing, timing), add/delete animations,
and drag custom bezier speed curves — all persisted back to the composition
HTML. Gated behind VITE_STUDIO_ENABLE_GSAP_PANEL.

Parsing of existing GSAP source now uses a recast + Babel AST parser instead of
regex, giving scope resolution, stable tween IDs, and round-trip preservation of
extras and unresolved raw values.

recast compiles to CommonJS that calls require("fs"), which breaks browser and
Vite SSR bundles. To contain it, @hyperframes/core is split into an isomorphic
layer and a Node-only AST layer:

- gsapSerialize.ts holds the recast-free helpers (serialization, keyframe
  conversion, validation, shared types). htmlParser.ts is now fully isomorphic.
- parseGsapScript and the script-mutation helpers live in gsapParser.ts,
  reachable only via the @hyperframes/core/gsap-parser subpath, loaded
  server-side by the studio-api mutation routes and the linter via dynamic
  import (recast stays external under SSR).
- The barrel and the gsap-constants subpath are recast-free, so studio browser
  bundles never trace recast.

Adds AST parser unit + stress coverage and e2e helpers for the panel.

* fix(lint): await async lintHyperframeHtml in all callers

lintHyperframeHtml became async (gsap rules use dynamic import)
but lintProject and check-hyperframe-static weren't awaiting it,
causing typecheck failures and runtime crashes in CI.

Also wire LintRule type in gsap rules to fix fallow unused-type
finding, and suppress render.ts exported-for-tests symbols.

packages/studio/src/components/editor/propertyPanelPrimitives.tsx

@@ -103,6 +103,8 @@ export function MetricField({
   disabled,
   liveCommit,
   scrub,
+  suffix,
+  tooltip,
   onCommit,
 }: {
   label: string;
@@ -110,6 +112,8 @@ export function MetricField({
   disabled?: boolean;
   liveCommit?: boolean;
   scrub?: boolean;
+  suffix?: string;
+  tooltip?: string;
   onCommit: (nextValue: string) => void;
 }) {
   const scrubRef = useRef<{ startX: number; startValue: number; pointerId: number } | null>(null);
@@ -151,7 +155,7 @@ export function MetricField({
       : ({ className: "flex-shrink-0 text-[11px] font-medium text-neutral-500" } as const);
 
   return (
-    <div className={FIELD}>
+    <div className={FIELD} title={tooltip}>
       <div className="flex min-w-0 items-center gap-3">
         <span {...scrubProps}>{label}</span>
         <CommitField
@@ -160,6 +164,7 @@ export function MetricField({
           liveCommit={liveCommit}
           onCommit={onCommit}
         />
+        {suffix && <span className="flex-shrink-0 text-[10px] text-neutral-600">{suffix}</span>}
       </div>
     </div>
   );