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Claude
885b77f1f3
Adds the Tier-3 minimum-viable theming primitives so a themed
nostrnests room renders without crashing the client:
ColorTag — `["c", "<hex6>", "background"|"text"|"primary"]`.
Strict 6-char hex parser; `#abc` shorthand and
named colors are REJECTED so a typo'd room
event can't crash the renderer. Output hex is
normalised uppercase, no `#` prefix.
BackgroundTag — `["bg", "<url>", "tile"|"cover"]`. Mode defaults
to COVER when missing; unknown modes (a future
"blur") fall back to COVER until the renderer
learns them. Empty URL is rejected.
MeetingSpaceEvent.colors() / .background() — tag accessors. The
font tag (`["f", family, optionalUrl]`) is intentionally NOT in
this commit; loading a custom FontFamily would need a per-pack
loader, and font-less rooms still render fine on the client.
Tests:
ColorTagTest — happy path, no-`#` prefix, rejects shorthand /
named / unknown target / missing target;
assemble normalisation; round-trip.
BackgroundTagTest — happy path, default-COVER, future-mode
fallback, rejects empty URL, round-trip.
The Compose `RoomTheme` projection + `AudioRoomThemedScope`
renderer come next.