- Rename `CLOUDFLARE_STREAM_NIKIV_VIDEO_ID` to `CLOUDFLARE_LIVE_INPUT_UID` in env.d.ts
- Remove hardcoded `LIVE_INPUT_UID` constant from `$username.tsx`
- Add `hlsUrl` state and update it based on API response in `$username.tsx`
- Modify stream playback logic to use `hlsUrl` for nikiv user
- Fetch HLS URL from server-side API and update state accordingly
- Update `check-hls.ts` to derive HLS URL dynamically from environment variables
- Remove `CLOUDFLARE_LIVE_INPUT_UID` from `wrangler.jsonc` environment variables
- Add `CLOUDFLARE_STREAM_NIKIV_VIDEO_ID` to environment variables
- Refactor `$username.tsx` to initialize stream data with default HLS URL
- Implement dynamic HLS URL update based on API response for Nikiv stream
- Modify `/api/check-hls` route to use environment variable for video ID
- Ensure HLS URL updates trigger stream data refresh in client
- Update `wrangler.jsonc` to include `CLOUDFLARE_STREAM_NIKIV_VIDEO_ID` in env vars
