feat(studio): s7.5 — delete shadow scaffolding; keep cutover flag (dark launch) (#1462)

Removes the SDK shadow telemetry: STUDIO_SDK_SHADOW_ENABLED, sdkShadow.ts +
sdkShadowGsapFidelity/GsapKeyframe/Numeric and their tests, the runShadow*
call-sites across the GSAP/timeline hooks, and the onDomEditPersisted shadow
callback in useDomEditSession. Moves patchOpsToSdkEditOps into sdkCutover.ts.

KEEPS STUDIO_SDK_CUTOVER_ENABLED as a dark-launch kill-switch — default false,
enable per-environment via VITE_STUDIO_SDK_CUTOVER_ENABLED=true. shouldUseSdkCutover
stays flag-gated. The stack can merge with zero behavior change; cutover is
validated by flipping the flag, not by removing it.

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

packages/studio/src/hooks/useGsapKeyframeOps.ts

@@ -1,6 +1,5 @@
 import { useCallback } from "react";
 import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
-import type { ShadowKeyframeOp } from "../utils/sdkShadowGsapKeyframe";
 import type { DomEditSelection } from "../components/editor/domEditingTypes";
 import { executeOptimistic } from "../utils/optimisticUpdate";
 import type { KeyframeCacheEntry } from "../player/store/playerStore";
@@ -59,13 +58,6 @@ export function useGsapKeyframeOps({
         percentage,
         properties: { [property]: value },
       };
-      // Shadow op (gsap_keyframe): SDK equivalent diffed via the commit chokepoint.
-      const shadowKeyframeOp: ShadowKeyframeOp = {
-        kind: "add",
-        animationId,
-        percentage,
-        properties: { [property]: value },
-      };
       void executeOptimisticKeyframeCacheUpdate({
         sourceFile,
         elementId: selection.id,
@@ -79,7 +71,6 @@ export function useGsapKeyframeOps({
           commitMutation(selection, mutation, {
             label: `Add keyframe at ${percentage}%`,
             softReload: true,
-            shadowKeyframeOp,
           }),
       }).catch((error) => {
         trackGsapSaveFailure(error, selection, mutation, `Add keyframe at ${percentage}%`);
@@ -95,16 +86,10 @@ export function useGsapKeyframeOps({
       percentage: number,
       properties: Record<string, number | string>,
     ) => {
-      const shadowKeyframeOp: ShadowKeyframeOp = {
-        kind: "add",
-        animationId,
-        percentage,
-        properties,
-      };
       return commitMutation(
         selection,
         { type: "add-keyframe", animationId, percentage, properties },
-        { label: `Add keyframe at ${percentage}%`, softReload: true, shadowKeyframeOp },
+        { label: `Add keyframe at ${percentage}%`, softReload: true },
       );
     },
     [commitMutation],
@@ -114,10 +99,6 @@ export function useGsapKeyframeOps({
     (selection: DomEditSelection, animationId: string, percentage: number) => {
       const sourceFile = selection.sourceFile || activeCompPath || "index.html";
       const mutation = { type: "remove-keyframe", animationId, percentage };
-      // Shadow op (gsap_keyframe): SDK has no %-based removeGsapKeyframe on main,
-      // so the runner resolves percentage → keyframeIndex against the pre-op
-      // script and no-ops on ambiguity (duplicate-percentage keyframes).
-      const shadowKeyframeOp: ShadowKeyframeOp = { kind: "remove", animationId, percentage };
       void executeOptimisticKeyframeCacheUpdate({
         sourceFile,
         elementId: selection.id,
@@ -131,7 +112,6 @@ export function useGsapKeyframeOps({
           commitMutation(selection, mutation, {
             label: `Remove keyframe at ${percentage}%`,
             softReload: true,
-            shadowKeyframeOp,
           }),
       }).catch((error) => {
         trackGsapSaveFailure(error, selection, mutation, `Remove keyframe at ${percentage}%`);