Clinic queue

[S-Mubarak]

I added a real-time clinic queue board for LumenHealth EHR so staff can easily see which patients are waiting in the lobby, with the nurse, or with the doctor. To unblock frontend development, I created a mock JSON array with five encounters in different states (WAITING, TRIAGE, and CONSULTATION) so the UI could be built and tested independently before the backend integration was completed.

On the backend, I implemented GET /api/v1/queue/today, which aggregates encounters created today that are in OPEN or IN_PROGRESS states, and added Server-Sent Events (SSE) so the frontend automatically receives updates whenever an encounter state changes. On the frontend, I built a Kanban-style board with columns for Waiting Room, Triage, and Consultation that displays patient cards with their name, system ID, and wait time, and allows staff to move patients between stages via drag-and-drop or a dropdown. The UI updates within five seconds of backend state changes without requiring a hard refresh and preserves scroll position without flickering when new data arrives.

closes #116

[inteee]

Please scope SSE fan-out by clinic. Right now queue update events are broadcast to every connected stream subscriber, which can leak one clinic’s queue movements to another clinic’s clients.

[inteee]

Good job. Approving