feat(timer): sync open tabs via SSE

[MegaBadCoder]

Summary

• SSE endpoint GET /api/events emits timer.updated on start, pause, stop, and expiry
• Open clients restore timer state from GET /tasks/timer instead of applying the event payload
• Caddy flushes /api/events immediately (flush_interval -1) so the stream is not buffered

Test plan

• Two tabs: start timer in one → the other picks up the session without refresh
• Pause in one tab → the other pauses to the same remaining time
• Stop/reset in one tab → the other clears the timer
• After deploy: Caddy container restarted so the new Caddyfile is live
• Local (no Caddy): Vite → localhost:3002 still streams

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