refactor: address review nits

- merge gsapResizeIntercept's duplicate module imports
- move the core-constant imports to the file headers (picker, domEditingDom)
- justify the cross-realm HTMLElement casts (iframe-realm nodes fail
  instanceof; access is duck-typed)

packages/studio/src/components/editor/domEditingDom.ts

@@ -3,6 +3,7 @@
  * selector utilities, and composition source resolution.
  * No imports from other domEditing* modules — safe to import from anywhere.
  */
+import { COLOR_GRADING_SOURCE_HIDDEN_ATTR } from "@hyperframes/core/color-grading";
 import { CURATED_STYLE_PROPERTIES } from "./domEditingTypes";
 
 // ─── Type guard ───────────────────────────────────────────────────────────────
@@ -28,8 +29,6 @@ export function isTextBearingTag(tagName: string): boolean {
   return ["div", "span", "p", "strong", "h1", "h2", "h3", "h4", "h5", "h6"].includes(tagName);
 }
 
-import { COLOR_GRADING_SOURCE_HIDDEN_ATTR } from "@hyperframes/core/color-grading";
-
 export function isElementVisibleThroughAncestors(el: HTMLElement): boolean {
   const win = el.ownerDocument.defaultView;
   if (!win) return true;

packages/studio/src/hooks/gsapResizeIntercept.ts

@@ -16,19 +16,18 @@ import {
   commitStaticGsapSize,
   commitKeyframedSizeFromResize,
   computeCurrentPercentage,
+  findExistingPositionWrite,
   findSizeSetAnimation,
   materializeIfDynamic,
 } from "./gsapDragCommit";
 import type { GsapDragCommitCallbacks } from "./gsapDragCommit";
-import { pickClosestToPlayhead } from "./gsapPositionDetection";
+import { pickClosestToPlayhead, readGsapPositionFromIframe } from "./gsapPositionDetection";
+import { commitWholePropertyOffset } from "./gsapWholePropertyOffsetCommit";
 import { resolveTweenStart, resolveTweenDuration } from "../utils/globalTimeCompiler";
 import { selectorFromSelection } from "./gsapShared";
 import { roundTo3 } from "../utils/rounding";
 import { resolveGroupTween, POSITION_CHANNELS } from "./gsapRuntimeBridge";
 import { hasNonHoldTweenForElement } from "./gsapRuntimeKeyframes";
-import { readGsapPositionFromIframe } from "./gsapPositionDetection";
-import { findExistingPositionWrite } from "./gsapDragCommit";
-import { commitWholePropertyOffset } from "./gsapWholePropertyOffsetCommit";
 
 const IDENTITY_ONE_PROPS = new Set(["opacity", "autoAlpha", "scale", "scaleX", "scaleY"]);
 
@@ -114,6 +113,8 @@ export async function tryGsapResizeIntercept(
   let scaleDraftDropPoint: { x: number; y: number } | null = null;
   let nonUniformScale = false;
   if (resizeGroup === "scale") {
+    // Iframe-realm element — instanceof HTMLElement fails across realms; the
+    // selector targets composition elements, and every use below is duck-typed.
     const el = iframe?.contentDocument?.querySelector(selector ?? "") as HTMLElement | null;
     // The resize draft modifies el.style.width/height, so read the ORIGINAL
     // dimensions saved by the draft system before it ran.

packages/studio/src/utils/gsapSoftReload.ts

@@ -319,8 +319,10 @@ export function applySoftReload(
     if (allTargets.length > 0 && win.gsap?.set) {
       const saved: Array<[HTMLElement, string]> = [];
       for (const el of allTargets) {
-        const s = (el as HTMLElement).style;
-        if (s?.cssText != null) saved.push([el as HTMLElement, s.cssText]);
+        // Iframe-realm node: instanceof HTMLElement fails across realms, and
+        // gsap targets() only yields elements here — style access is duck-typed.
+        const styled = el as HTMLElement;
+        if (styled.style?.cssText != null) saved.push([styled, styled.style.cssText]);
       }
       try {
         win.gsap.set(allTargets, { clearProps: "all" });