Completes the U3 frontend that T5a's crashed dispatch left half-done.
- /reset-password/[token] — public; new password + confirm. Calls
POST /api/auth/reset-password with the URL's token. invalid_token,
password_too_short, and mismatched-passwords surface as inline
errors. Success redirects to /login?reset=ok.
- /admin/integrations gains an SMTP card (alongside Lidarr) with
enabled toggle + all fields + Save and Send-test-email buttons.
Password input is a separate state from the loaded form, so empty
submission preserves the stored server-side value (matches the
backend's empty-password-preserves contract). Test button error
codes (no_email_on_file / not_configured / send_failed) surface
as actionable toasts.
Tests cover both new pages plus extensions to settings + integrations
test files for the cards landed in T5a.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>