EGG-10 lets each `["c", hex, role]` tag stand alone, but a half-
applied palette (themed background + platform text, or themed text
+ platform background) collides with whichever system theme — light
or dark — the user is on. A room that ships ONLY `background=#FFE4B5`
ends up with platform-default white text on dark theme; unreadable.
Gate all three color overrides on having a complete bg + text pair
inside `RoomTheme.from(event)`. When either is missing the whole
palette drops to null and renderers fall through to the platform
theme. Background image (`bg`) and font tags still flow through —
they don't break contrast on their own.
Both consumers — NestThemedScope (room screen) and NestJoinCard
(lobby) — pick up the change without code edits because they read
through the same `RoomTheme` projection.
The nostrnests-style `["color", "gradient-7"]` tag was never parsed
(our `c`-tag parser ignores it), so events shipping only that don't
override anything either way; this fix targets the genuine half-
applied case (rooms that emit one EGG-10 c-tag without the matching
companion).
https://claude.ai/code/session_01RDpuki4t8StSg1CZcXnV5b
Claude
15169de7e5