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e6cf11f68c
The injected client reconnected on a fixed 1s timer with no feedback: if the laptop slept or the server restarted, the page showed 'Connected' over a dead socket and silently queued events. And when the server stopped, the user got a bare connection-refused with no explanation. helper.js now: - reconnects with exponential backoff (500ms, doubling, capped at 30s; reset on open), with an onerror->close handler, nulls the socket on close, and clears a pending timer before scheduling another; - drives the frame status pill Connected/Reconnecting/Disconnected via a --status-color custom property (frame-template.html); - after ~15s disconnected, shows a self-styled 'Companion paused' overlay (tombstone) explaining the companion stopped and will reconnect automatically; - on recovery from a tombstoned outage (e.g. server restarted on the same port) reloads to pick up the restarted server's current screen. The reconnect-backoff is an exported pure function; helper.test.js unit-tests it (doubling + cap progression) and asserts the status/tombstone/reconnect wiring. DOM behaviour is verified live. Refs #856, #1237