Theming wallet surfaces

Seams renders UI in two places: React components on the application origin and protected surfaces on the wallet origin. Give both the same semantic palette and shape vocabulary.

Use Theme and its tokens for app-owned components. Set appearance during SDK configuration, or call setAppearance, for the auth menu, confirmer, and export viewer inside the wallet iframe.

Start from LIGHT_TOKENS, DARK_TOKENS, and one SHAPE_PRESETS branch. Override semantic roles as a complete light/dark pair. Check text contrast, visible focus, status meaning, and forced-color behavior after every palette change.

The detailed token table and examples remain in the theming reference.