Florian Schroedl 455e80f4e8 feat: add SSE live sync between clients ...

When any client pushes changes, the server broadcasts an SSE event to
all connected clients watching that group. Clients immediately pull
the latest data — no polling delay, no page reload.

Server (~30 lines):
- GET /events?group=G — SSE endpoint, holds connection open
- On successful POST /sync, notify all SSE listeners for affected groups
- Auth-aware: respects token and group permissions
- Auto-cleanup on disconnect via http-kit on-close

Client (~25 lines):
- EventSource connects to /events?group=G on sync loop start
- On SSE message, triggers do-pull! to fetch latest data
- Auto-reconnects (browser EventSource built-in behavior)
- Cleanup on destroy!

Periodic polling remains as fallback (30s default). SSE provides
sub-second sync for the common case.

2026-04-04 17:14:55 +02:00

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