Add SSE heartbeat, polling fallback, and --poll flag#5
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…dates - Server sends SSE heartbeats every 5s to keep connections alive through proxies - Client monitors heartbeats; falls back to polling if none arrive within 7.5s - Polling updates every 1s when tab is visible, 5s when hidden (visibility API) - Auto-detect Cloudflare Quick Tunnel (.trycloudflare.com) and force polling - Add --poll CLI flag to force polling mode (useful for known SSE-broken proxies) - Tooltip shows connection mode: "Connected via SSE" or "Connected via polling" - API responses have Cache-Control: no-store to prevent proxy caching - Heartbeat tests verify timing and SSE format - All existing tests pass Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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Summary
Adds reliable real-time dashboard updates even through problematic proxies like Cloudflare Quick Tunnels:
--pollCLI flag to force polling mode for known SSE-incompatible environmentsTechnical Details
Cache-Control: no-storeto prevent proxy caching of stale responsesevent: heartbeat) are used so client can detect livenessAll existing tests pass; 3 new heartbeat tests added.
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