The wordmark and tagline on an empty chat had no off switch. Add an
Appearance row, Intro Splash, that hides it. The setting is on by
default, so the current experience does not change.
The splash is renderer chrome and no other Hermes surface can change
it, so the state stays local (localStorage) like the Chat Backdrop
toggle beside it. It does not mirror into gateway config.
Move the visibility condition out of the chat god-component into
shouldShowIntro(), next to the isRouteSessionMismatch() helper. The
tests prove that the toggle outranks every window and session clause:
off is off.
ethernet
fdf6f1d4c8