refactor(studio): simplify hooks, split contexts, remove dead code (#1416)

* fix(studio): guard Zustand no-op setters and fix useConsoleErrorCapture memory leak

- Guard setIsPlaying to skip set() when value unchanged (eliminates 60
  notifications/sec during reverse playback)
- Guard caption store selectGroup to bail before set() when group missing
  (prevents empty Zustand notifications)
- Guard clearSelection to skip when already empty
- Fix useConsoleErrorCapture: restore original console.error, remove error
  event listener, and delete __hfErrorCapture flag on cleanup

* fix(studio): delete dead files and unused exports

Remove 7 dead files (audioBeatDetection, keyframeSnapping,
timelineInspector, DopesheetStrip, StaggerControls,
TimelineLayerPanel, TimelineEditorNotice) and their test companions.

Delete unused computeFitToChildrenSize export from propertyPanelHelpers.

Fix re-export indirection: useDomEditCommits and studioMotionOps.test
now import patch builders directly from manualEditsDomPatches instead
of the re-export passthrough in manualEditsDom.

* fix(studio): eliminate effect-chain state mirroring for lint findings, hover, and GSAP fetch

Move lint findingsByElement sync from App.tsx into useLintModal where
the value is produced, removing the mirroring useEffect. Consolidate
4 hover-clearing effects in useDomSelection into 2 (one unconditional
on context change, one conditional combining caption mode, selection
match, and disconnected element checks). Fold the GSAP retry effect
into the fetch effect in useGsapTweenCache, scheduling a single retry
via setTimeout when the initial fetch returns 0 animations.

Eliminates 3 unnecessary render cycles from effect chains.

* fix(studio): memoize renderQueue, toolbar, and canvas rect to prevent re-render cascade

- Wrap renderQueue object in useMemo so StudioContext consumers don't
  re-render on every App render
- Memoize timelineToolbar JSX so NLELayout memo isn't defeated
- Move canvasRect getBoundingClientRect() from render-time IIFE to a
  useLayoutEffect-backed ref, eliminating layout thrashing
- Track and clear setTimeout handles in refreshPreviewDocumentVersion
  to prevent stale timer accumulation on rapid calls and unmount

* refactor(studio): consolidate GSAP shared primitives — defaults, iframe access, keyframe parsing

Extract duplicated PROPERTY_DEFAULTS, IframeGsap interface, iframe
accessors (getIframeGsap, queryIframeElement), percentage keyframe
parsing, and toAbsoluteTime into a single gsapShared.ts module.

Removes ~120 lines of copy-pasted logic across 8 hook files, reducing
drift risk between the duplicate implementations.

* fix(studio): remove dead store fields, dead file, duplicate helper, and unsafe assertions

* refactor(studio): deduplicate selector helpers, rounding utils, percentage computation, and iframe access

* fix(studio): split StudioContext into Shell + Playback to prevent cascade re-renders

* refactor(studio): decompose useGsapScriptCommits into focused mutation hooks

* refactor(studio): decompose useFileManager into focused file operation hooks

Extract useFileTree (tree loading, refresh, derived assets/compositions)
and useEditorSave (debounced save with history tracking) from the 508-LOC
useFileManager. The parent hook composes both and retains file I/O,
click-to-source, upload/import, and CRUD — preserving the same public
interface so no consumers change.

* refactor(studio): decompose useDomEditCommits into focused commit hooks

Extract geometry (path offset, box size, rotation) and element lifecycle
(delete, z-index reorder) into useDomGeometryCommits and
useElementLifecycleOps. Parent keeps persistDomEditOperations as core
and composes all sub-hooks — public interface unchanged.

* refactor(studio): simplify useAppHotkeys with declarative command table

* refactor(studio): simplify useAppHotkeys with declarative command table

Replace 15 individual useRef callback refs with a single cbRef object.
Extract keydown dispatch into pure dispatchModifierKey/dispatchPlainKey
functions. Merge duplicate undo/redo logic into shared applyHistory.
Extract cross-origin listener boilerplate into safeAddListener/safeRemoveListener.

Hook body: 204 LOC (down from 445). Public API unchanged.

* fix(studio): remove unused getDomEditTargetKey import

* refactor(studio): decompose useDomEditSession into focused editing hooks

Extract GSAP-aware geometry intercepts (move/resize/rotation) and
animated property commit into useGsapAwareEditing, and selection
wiring, GSAP cache management, preview sync, and selection handlers
into useDomEditWiring. The parent remains a pure composition shell.

* style(studio): fix formatting in 5 files

* fix(studio): trim App.tsx to 598 lines (under 600 limit)

---------

Co-authored-by: Miguel Ángel <miguel07alm@protonmail.com>

packages/studio/src/hooks/gsapDragCommit.ts

@@ -6,11 +6,9 @@ import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
 import type { DomEditSelection } from "../components/editor/domEditingTypes";
 import { usePlayerStore } from "../player/store/playerStore";
 import { readRuntimeKeyframes, scanAllRuntimeKeyframes } from "./gsapRuntimeKeyframes";
-import {
-  absoluteToPercentage,
-  resolveTweenStart,
-  resolveTweenDuration,
-} from "../utils/globalTimeCompiler";
+import { resolveTweenStart, resolveTweenDuration } from "../utils/globalTimeCompiler";
+import { roundTo3 } from "../utils/rounding";
+import { computeElementPercentage } from "./gsapShared";
 export interface GsapDragCommitCallbacks {
   commitMutation: (
     selection: DomEditSelection,
@@ -26,25 +24,12 @@ export interface GsapDragCommitCallbacks {
   fetchAnimations?: () => Promise<GsapAnimation[]>;
 }
 
-// ── Percentage computation ─────────────────────────────────────────────────
-
+// Re-export for backward compatibility with existing imports.
 export function computeCurrentPercentage(
   selection: DomEditSelection,
   animation?: GsapAnimation,
 ): number {
-  const currentTime = usePlayerStore.getState().currentTime;
-  if (animation) {
-    const start = resolveTweenStart(animation);
-    const duration = resolveTweenDuration(animation);
-    if (start !== null) {
-      return absoluteToPercentage(currentTime, start, duration);
-    }
-  }
-  const elStart = Number.parseFloat(selection.dataAttributes?.start ?? "0") || 0;
-  const elDuration = Number.parseFloat(selection.dataAttributes?.duration ?? "1") || 1;
-  return elDuration > 0
-    ? Math.max(0, Math.min(100, Math.round(((currentTime - elStart) / elDuration) * 1000) / 10))
-    : 0;
+  return computeElementPercentage(usePlayerStore.getState().currentTime, selection, animation);
 }
 
 // ── Dynamic keyframe materialization ──────────────────────────────────────
@@ -133,8 +118,8 @@ async function extendTweenAndAddKeyframe(
       type: "replace-with-keyframes",
       animationId: anim.id,
       targetSelector: anim.targetSelector,
-      position: Math.round(newStart * 1000) / 1000,
-      duration: Math.round(newDuration * 1000) / 1000,
+      position: roundTo3(newStart),
+      duration: roundTo3(newDuration),
       keyframes: remappedKfs,
     },
     { label: `Move layer (extended keyframe)`, softReload: true, beforeReload },
@@ -330,8 +315,8 @@ export async function commitGsapPositionFromDrag(
         {
           type: "add-with-keyframes",
           targetSelector: anim.targetSelector,
-          position: Math.round(newStart * 1000) / 1000,
-          duration: Math.round(newDuration * 1000) / 1000,
+          position: roundTo3(newStart),
+          duration: roundTo3(newDuration),
           keyframes,
         },
         { label: "Move layer (from extended)", softReload: true, beforeReload: restoreOffset },