These render the initial dashboard page today and will also be
rendered standalone by the sync routes in the next commits, so the
same markup drives both the full page and the post-sync response.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Adds a self-hosted stylesheet (no CDN dependencies) with a card-based
dashboard and color-coded status badges, and shows the last 10 sync
runs per user on the detail page.
