Add resolved appearance engine and paired theme settings

Resolve light, dark and automatic appearance centrally and publish live theme snapshots to native surfaces and the appearance portal. Add paired preset families, custom theme imports, accessibility transforms and contrast-safe transitions.

Refine the Settings gallery and Auto controls, move overrides under advanced customization, and share palette-aware switches and circular slider thumbs. Document configuration and include theme licenses and integration coverage.

crates/ferese-theme/README.md

@@ -4,8 +4,9 @@ The shared native UI theme for the shell, settings, lock screen, authentication
 prompt and screen-sharing/recording chooser.
 
 - `Palette` resolves KDL colors and corners and builds the native toolkit theme.
-- `PRESETS` defines the six built-in color schemes.
+- `PRESETS` defines twelve variants in six families.
 - `font` and `text` provide shared font selection and text.
+- `gallery` supplies split theme tiles, accessible radio groups and keyboard navigation.
 - `controls` supplies surfaces, navigation, font-aware text buttons and input styles.
 - `menus` supplies headings, rows, sections, separators, switches and slider styles.
 - `calendar` supplies date/time labels, stacked clock digits and calendar grids.