chore(release): v1.21.2.1

Hotfix: the Coach and daily briefing failed for ChatGPT-provider accounts —
a provider tool-call rejection surfaced as a 500. Provider failures now
degrade gracefully, the Codex tool-call wire format is corrected, and the
provider error body is captured for diagnosis. Also: the thinking bubble
shows only the animated dots.

src/app/api/insights/chat/route.ts

@@ -1107,9 +1107,7 @@ async function streamRefusal(args: {
  * GlitchTip path. Status mapping mirrors `AllProvidersFailedError`: 401/403 →
  * credential_expired, 429 → rate_limited, everything else → unavailable.
  */
-function classifyBubblingProviderError(
-  err: unknown,
-): {
+function classifyBubblingProviderError(err: unknown): {
   code: "credential_expired" | "rate_limited" | "unavailable";
   httpStatus: number | null;
 } | null {