- Install `curl` in Dockerfile for healthcheck/tooling support
- Add class-based dark mode via Tailwind `@custom-variant` and a
pre-paint `<script>` in `app.html` to avoid theme flash on load
- Implement theme toggle in layout with system preference detection,
`localStorage` persistence, and smooth transitions
- Update all UI components with `dark:` variants for full dark mode
support across backgrounds, borders, and text colours
- Add `sendTelemetry` helper in `api.ts` for fire-and-forget
client-side error reporting to `/api/v1/telemetry`
- Configure structured logging via environment variable
- Add Prometheus metrics for HTTP request tracking and health
- Secure /metrics endpoint with IP allowlisting
- Update .dockerignore to exclude build artifacts
