connection status stays green after the session actually drops

Confirmed and this is a good catch. The indicator was reflecting the socket state rather than data freshness, which is exactly the wrong thing during a stall. Changing it to reflect time-since-last-update so a silent feed shows as stale.

Freshness rather than connectivity is the correct signal. Glad this is being changed.

Checked against the current build and closing this: the connection indicator already reflects data freshness rather than socket state. The status bar marks the stream stale when no update has arrived for 7 seconds, and alongside it we show feed lag (exchange timestamp to arrival) and received ticks per second, which reads zero when pushes stop. A silent feed shows as stale rather than green, which is what you asked for.

Good outcome. Question on the 7 second threshold. Is it fixed, or does it account for instruments that genuinely go minutes without a print in slow hours? Thin names could sit stale most of the session otherwise.

The feed lag number is the underrated half of this. Stale/not stale is binary, but a lag figure that's creeping up tells you something is going wrong before it fully breaks, same reason I watch the trend in my drawdown rather than just the limit.