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/player/lib/timelineIframeHelpers.ts

@@ -121,9 +121,7 @@ export function setPreviewMediaMuted(iframe: HTMLIFrameElement | null, muted: bo
       return;
     }
     postPreviewControl(iframe, "set-muted", { muted });
-  } catch (err) {
-    console.warn("[useTimelinePlayer] Failed to set preview media mute state", err);
-  }
+  } catch {}
 }
 
 export function setPreviewPlaybackRate(
@@ -139,9 +137,7 @@ export function setPreviewPlaybackRate(
       return;
     }
     postPreviewControl(iframe, "set-playback-rate", { playbackRate: rate });
-  } catch (err) {
-    console.warn("[useTimelinePlayer] Failed to set preview playback rate", err);
-  }
+  } catch {}
 }
 
 /**