chore(studio): remove all console.* calls from studio package (#1691)

* chore(studio): remove all console.* calls from studio package

* chore(studio): address review — remove dead stubs, restore consent notice

- Delete empty if-blocks left after console removal (snapTargetCollection,
  Player asset-poll, useTimelineSyncCallbacks 5s probe, useGestureRecording
  dev guard + now-unused isDevBuild) and the stale "surface in dev" comment.
- Drop the dangling no-console pragma + dead duplicate-id branch in sourcePatcher.
- Restore the one-time telemetry consent disclosure in showNoticeOnce (kept
  behind a pragma — it is a user-facing notice, not debug noise).
- Remove the missed timelineIcons console.warn while preserving the
  `tag || "div"` null-safety fallback.
- Route caption auto-save failures (a data-loss path) through telemetry
  instead of swallowing silently.
- Restore the accidentally-clobbered css-var-fonts output.mp4 fixture.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/studio/src/utils/sourcePatcher.ts

@@ -239,16 +239,6 @@ function execDataAttrPattern(html: string, attr: string, value: string): TagMatc
   const pattern = new RegExp(`(<[^>]*\\b${attr}=(["'])${escapeRegex(value)}\\2[^>]*)>`, "i");
   const match = pattern.exec(html);
   if (match?.index == null) return null;
-  // Defensive: a second exact match means a duplicate id/attr in the source
-  // (id drift). Don't silently patch the first while leaving the other stale —
-  // surface it. By the mint contract this should never fire.
-  const all = html.match(new RegExp(`<[^>]*\\b${attr}=(["'])${escapeRegex(value)}\\1[^>]*>`, "gi"));
-  if (all && all.length > 1) {
-    // eslint-disable-next-line no-console
-    console.warn(
-      `sourcePatcher: ${attr}="${value}" matched ${all.length} elements; patching the first. ids/attrs must be unique per document.`,
-    );
-  }
   return { tag: match[1], start: match.index, end: match.index + match[1].length };
 }