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/src/lib.rs

@@ -3,15 +3,17 @@ mod button;
 pub mod calendar;
 mod contrast;
 pub mod controls;
+pub mod gallery;
 pub mod icons;
 pub mod material;
 pub mod menus;
 mod palette;
 mod presets;
+pub mod service;
 mod typography;
 
 pub use button::accent_button;
 pub use contrast::{accent_color, accent_pair, apply, composite, contrast, foreground, luminance};
-pub use palette::{Palette, material_opacity, mix, parse_color, surface_shade};
+pub use palette::{Palette, mix, parse_color, surface_shade};
 pub use presets::{PRESETS, Preset};
 pub use typography::{font, text};