fix(studio): save retries, mutation queue circuit breaker, save_failure diagnostics (#1366)

* fix(studio): save retries, mutation queue circuit breaker, save_failure diagnostics

Save failures could silently drop user work: code-editor saves fired a single
PUT with no retry, DOM-edit failures drained the whole queue against a failing
server, and several failure paths only logged to the console.

- Retry code-editor saves with exponential backoff instead of dropping the
  edit on the first failed PUT.
- Circuit breaker on the DOM-edit save queue: a failing server pauses the
  queue with a user-visible error state instead of burning every queued
  mutation against it.
- save_failure events now carry error_message, status_code, and source on
  every emission path; style/attribute DOM-edit failures that previously only
  logged to the console now emit telemetry too.
- Route unawaited commitMutation call sites (GSAP drag, property scrubbing,
  undo/redo, text fields) through a safe wrapper that reports failures via
  telemetry instead of unhandledrejection.

Follow-ups (deferred): version/ETag conflict guard on file PUTs, offline
save queue.

* fix(studio): narrow save retry changes for fallow

packages/studio/src/hooks/useGsapAnimationFetchFallback.ts

@@ -0,0 +1,19 @@
+import { useCallback } from "react";
+import type { DomEditSelection } from "../components/editor/domEditing";
+import { fetchParsedAnimations, getAnimationsForElement } from "./useGsapTweenCache";
+
+export function useGsapAnimationFetchFallback(projectId: string | null, gsapSourceFile: string) {
+  return useCallback(
+    (selection: DomEditSelection) => async () => {
+      const pid = projectId;
+      if (!pid) return [];
+      const parsed = await fetchParsedAnimations(pid, gsapSourceFile);
+      if (!parsed) return [];
+      return getAnimationsForElement(parsed.animations, {
+        id: selection.id ?? null,
+        selector: selection.selector ?? null,
+      });
+    },
+    [projectId, gsapSourceFile],
+  );
+}