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/gsapScriptCommitHelpers.ts

@@ -0,0 +1,33 @@
+import type { DomEditSelection } from "../components/editor/domEditingTypes";
+
+export const PROPERTY_DEFAULTS: Record<string, number> = {
+  opacity: 1,
+  x: 0,
+  y: 0,
+  scale: 1,
+  scaleX: 1,
+  scaleY: 1,
+  rotation: 0,
+  width: 100,
+  height: 100,
+};
+
+export function ensureElementAddressable(selection: DomEditSelection): {
+  selector: string;
+  autoId?: string;
+} {
+  if (selection.id) return { selector: `#${selection.id}` };
+  if (selection.selector) return { selector: selection.selector };
+
+  const el = selection.element;
+  const doc = el.ownerDocument;
+  const tag = el.tagName.toLowerCase();
+  let id = tag;
+  let n = 1;
+  while (doc.getElementById(id)) {
+    n += 1;
+    id = `${tag}-${n}`;
+  }
+  el.setAttribute("id", id);
+  return { selector: `#${id}`, autoId: id };
+}