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.

site/content/index.md

@@ -6,7 +6,7 @@ windows, and a shared theme for its desktop tools.
 ## Get started
 
 1. [Install Ferese](installation.md), or try a [nested preview](installation.md#preview-and-logs).
-2. Open **Control Center → Settings** to choose a theme and configure your desktop.
+2. Choose Light, Dark, or Auto in **Control Center**. Open **Settings** for [theme files and presets](theme-engine.md).
 3. Use the [configuration reference](configuration.md) for shortcuts, gestures, window rules, and displays.
 
 ## Default shortcuts