Connected apps, graceful errors, hardening

What's new

Connected apps in your dashboard. A new Connected apps page lists every third-party application you've authorized to reach QuizBase on your behalf — for example Claude.ai connected over MCP — along with the scopes it was granted. Revoke any of them in one click: access is cut immediately and the app has to ask for your authorization again before it can connect. Available in English and Polish.

Clearer errors under load. A small number of rarely-requested topic pages (mostly long-tail Polish topics) could time out with a generic error on a cold cache. They now return a proper 503 with a Retry-After hint, in line with the standard error contract — retry once and the warm response comes back. See /docs/errors-and-retries.
Playgrounds are easier to find. The REST API and MCP playgrounds now live side by side with a tabbed switcher, are linked from the footer and the relevant API docs, and the MCP playground is fully localized (EN/PL).
Security and reliability hardening. A round of infrastructure and abuse-protection improvements across the edge, rate limiting, and account surfaces. No action needed on your side.

Integration guides refreshed. The Reddit weekly trivia bot and Roblox classroom guides now ship current, working code — the Reddit guide drops an unmaintained wrapper for a dependency-free OAuth2 flow, and the Roblox guide uses the current secrets API.
No breaking changes — existing keys, requests, and SDK code keep working unchanged.