Add guest tally (on air / off air) and host connection warning

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -61,6 +61,16 @@ New link (ends the session, clears chat), Revoke, Copy, End audio, Kick, Clear c
 live meters for both directions and the selected network route. The page never plays sound
 (it is on the rig): a new guest message flashes the tab title.
 
+**Tally (On air / Off air)**, added 2026-11-06: a button on the console sets a big ON AIR / Off air
+bar on the guest's page. It is **only a sign**: it changes no audio, and the guest is heard
+whenever their fader is up. It is set by hand and reset to Off air by New link / Revoke.
+
+**Connection warning**, added 2026-11-06: a banner on the console when the guest -> show audio
+is audibly struggling over the last 10 s. "Wobbling" means 3 or more patched gaps (concealed
+frames) or one buffer dropout. "Bad" (red) means 25 or more gaps, 3 or more dropouts, or the
+connection dropping. FEC recoveries are inaudible and do not count. When it turns red and the
+tab is in the background, the tab title flashes (no sound).
+
 ## Chat
 Anonymous: no accounts, and the guest's name is optional (default "Guest"). The guest sees
 the host as `-host-label` (default "Host"). Messages are kept **in memory only** (last 300),