Add a TrustCenter.themedLogoUrl Relay live resolver that reads the
light and dark logos from the graph and subscribes to the system
prefers-color-scheme media query, returning the dark logo (falling
back to the light one) when the OS prefers dark.
The TopBar now selects this single field instead of pulling both logo
URLs and branching on useSystemTheme, keeping the theme-to-URL logic in
the graph where any component can reuse it.
Signed-off-by: Émile Ré <emile@probo.com>
2a69129a83