feat(studio): keyframe system — parser, runtime, timeline UI, design panel, gesture recording (#1311)

* feat(studio): runtime hooks — global time compiler + keyframe runtime

Add the runtime bridge layer: global time compilation (tween % → clip %),
soft reload after mutations, runtime keyframe preview, and keyframe
commit helper.

* feat(studio): runtime hooks — global time compiler + keyframe runtime

Add the runtime bridge layer: global time compilation (tween % → clip %),
soft reload after mutations, runtime keyframe preview, and keyframe
commit helper.

* feat(studio): keyframe cache + commit hooks

Add hooks for keyframe cache population (tween → clip-relative %),
mutation dispatch, keyframe snapping, and audio beat detection.

* feat(studio): timeline UI — dopesheet diamonds + keyboard nav

Add dopesheet strip with diamond keyframe indicators, timeline property
rows, keyboard navigation (J/Shift+J/Delete/K), and feature gate
(STUDIO_KEYFRAMES_ENABLED defaults to false).

* feat(studio): design panel — arc controls + ease curve + stagger

Add arc path controls (curviness slider, auto-rotate), motion path SVG
overlay, ease curve visualization, stagger controls, and expanded
animation card. Includes border-radius editor dependency from #1217.

* feat(studio): gesture recording core

Add gesture recording engine with RAF sampling, modifier key property
mapping (Shift→rotationXY, Alt→rotation, Cmd→opacity),
Ramer-Douglas-Peucker simplification, and ghost trail SVG overlay.

* fix(studio): keyframe drag + recording bug bash

21 fixes: capture GSAP base at drag start, translate:none before
gsap.set, skip reapplyPathOffsets for GSAP elements, clamp recording
seek, _auto flag for 100% keyframes, overlay flash fix, block edits
during recording.

* feat(studio): keyframe integration wiring + docs

Wire App.tsx recording orchestration, TimelineToolbar K/R buttons,
PropertyPanel per-property diamonds, shortcuts panel, toast
notifications, and keyframes guide documentation. All gated on
STUDIO_KEYFRAMES_ENABLED (default false).

packages/studio/src/components/StudioRightPanel.tsx

@@ -32,6 +32,9 @@ export interface StudioRightPanelProps {
     compositionPath: string;
   } | null;
   onCloseBlockParams?: () => void;
+  recordingState?: "idle" | "recording" | "preview";
+  recordingDuration?: number;
+  onToggleRecording?: () => void;
 }
 
 // fallow-ignore-next-line complexity
@@ -41,6 +44,9 @@ export function StudioRightPanel({
   motionPanelActive,
   activeBlockParams,
   onCloseBlockParams,
+  recordingState,
+  recordingDuration,
+  onToggleRecording,
 }: StudioRightPanelProps) {
   const {
     rightWidth,
@@ -92,6 +98,8 @@ export function StudioRightPanel({
     handleGsapAddFromProperty,
     handleGsapRemoveFromProperty,
     commitAnimatedProperty,
+    handleSetArcPath,
+    handleUpdateArcSegment,
   } = useDomEditContext();
 
   const { assets, fontAssets, projectDir, handleImportFiles, handleImportFonts } =
@@ -226,6 +234,11 @@ export function StudioRightPanel({
                   onRemoveGsapFromProperty={handleGsapRemoveFromProperty}
                   onAddGsapAnimation={handleGsapAddAnimation}
                   onCommitAnimatedProperty={commitAnimatedProperty}
+                  onSetArcPath={handleSetArcPath}
+                  onUpdateArcSegment={handleUpdateArcSegment}
+                  recordingState={recordingState}
+                  recordingDuration={recordingDuration}
+                  onToggleRecording={onToggleRecording}
                 />
               ) : motionPanelActive ? (
                 <MotionPanel