Proxies (Cloudflare, nginx) drop idle WebSocket connections before the
application notices, leaving clients typing into dead sockets.
- Add server-side ping/pong heartbeat (30s) in terminal-server.js;
terminate unresponsive clients instead of letting connections go stale
- Move client keepAlive interval start to the connect event so it
restarts correctly after reconnects
- Remove hidden-tab keepalive short-circuit — server pings now own
liveness; suppressing client pings while hidden masked proxy drops
- Fix clearAllTimers to use clearTimeout for one-shot timers
- On visibility resume, probe with a 5s timeout instead of the default
35s so half-open sockets are detected quickly
- Bump coolify-realtime to 1.0.14 across all compose files
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