[efegokdemir]

Summary

Make form submission errors discoverable to screen readers and associate the authentication form fields with their error message.

Changes

• Render FormError as an assertive alert with a stable, reusable id.
• Connect login and registration inputs with aria-describedby when an error is present.
• Mark the affected authentication inputs aria-invalid while the form error is shown.
• Add server-rendered regression tests for the alert semantics and empty state.

Testing

• git diff --check — passed.
• npm ci — local dependency installation stalled before completing, so no local test pass is claimed.
• GitHub Actions will run the repository's lint, typecheck, and production build checks.

Notes

The existing visual styling and error text are unchanged. Other pages continue using FormError and automatically gain the alert semantics without changing their behavior.

Fixes #142

[netlify]

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