Extract shared UI and theme packages

packages/theme/src/index.ts

@@ -0,0 +1,26 @@
+export type { Appearance } from "./appearance";
+export {
+  getCSSAppearance,
+  getWindowAppearance,
+  resolveAppearance,
+  subscribeToPreferredAppearance,
+  subscribeToWindowAppearanceChange,
+} from "./appearance";
+export { defaultDarkTheme, defaultLightTheme } from "./defaultThemes";
+export { YaakColor } from "./yaakColor";
+export type {
+  DocumentPlatform,
+  YaakColorKey,
+  YaakColors,
+  YaakTheme,
+} from "./window";
+export {
+  addThemeStylesToDocument,
+  applyThemeToDocument,
+  completeTheme,
+  getThemeCSS,
+  indent,
+  platformFromUserAgent,
+  setThemeOnDocument,
+  setPlatformOnDocument,
+} from "./window";