refactor(appearance): organize components and hooks

packages/appearance/src/theme.ts

@@ -4,7 +4,7 @@ import {
   type BaseColor,
   type ThemeColorConfig,
   type ThemeScheme,
-} from "./themes"
+} from "./internal/themes"
 import {
   getColorVisionCssVariables,
   type ColorVisionMode,
@@ -20,7 +20,7 @@ export {
   type Theme,
   type ThemeColorConfig,
   type ThemeScheme,
-} from "./themes"
+} from "./internal/themes"
 
 export const THEME_STYLE_ELEMENT_ID = "ui-theme-variables"