- handleFetch injects X-XSRF-TOKEN + XSRF-TOKEN cookie on all mutating
backend API requests (double-submit cookie pattern); generates a fresh
UUID when no XSRF-TOKEN cookie exists yet
- ErrorCode union gains CSRF_TOKEN_MISSING and TOO_MANY_LOGIN_ATTEMPTS;
getErrorMessage maps both to i18n keys
- de/en/es messages add error_csrf_token_missing and
error_too_many_login_attempts translations
- Login action maps HTTP 429 to fail(429, { ..., rateLimited: true });
page shows a muted clock icon with aria-invalid on rate-limit errors
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Six tests covering: load() exposes ?registered and ?reason; action returns 400
on missing email; 401 with INVALID_CREDENTIALS on backend reject; success
re-emits fa_session and deletes legacy auth_token; 500 when backend omits
fa_session in Set-Cookie. Closes the frontend coverage gap on the credential-
handling logic that moved out of the Java side. Addresses PR #612 / Sara S1.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
