Add statistics status dashboard

[mre]

Summary

• Render /statistics as an HTML status dashboard.
• Calculate endpoint statistics from the same getStatus() data used by /status.
• Show 90 daily bars per endpoint.
• Use grey bars before data exists, green bars for complete days, and amber bars for days with missing successful updates.
• Use Handlebars partials for the endpoint card and failed podcast list.

Hover text

Each daily bar has a title with the date and success count, for example: 2026-07-22: 20/38 successful, 18 failed. Grey bars say no data available.

Note

The updates table only records successful imports. A failed podcast or daily bar means no successful update was recorded for that endpoint in the relevant window, not a recorded failed attempt.

Validation

• npm run build
• npm run lint
• npx jest src/api/StatusApi.test.ts src/db/StatusRepository.test.ts --runInBand