syncTabGroup was including 'connecting' tabs in the group unconditionally,
so when the relay WebSocket closed and all tabs transitioned to 'connecting',
the group stayed green. Now 'connecting' tabs are only included when the
relay is actually connected (connectionState === 'connected'). When the
relay is dead, 'connecting' tabs are excluded and the group gets cleaned up.
The onUpdated handler at line ~1601 already guards against the
ungroup→disconnect loop for 'connecting' tabs, so this is safe.
Tommy D. Rossi
c9809967e5