05c1e8d18b
The public quote, contract-signing, and payment-check pages baked a single
light logo (the contract page showed none), so the dark page rendered a
dark-text logo on a dark background.
- usePublicDarkMode now returns { isDark } (reactive) alongside applying
the .dark class, so pages can pick a theme-aware asset.
- The three public routes now surface both branding logo URLs (logoUrl +
logoUrlDark) in the issuer block; the contract issuer gains a logo too.
- QuoteResponsePage, ContractResponsePage, and the payment-check
BrandingHeader pick the dark variant when isDark, falling back to
whichever exists. Covers the accept/accepted states of each page.