Squash merge feat/expo-app: app-expo, .cursor, workflows, package.json, .husky; remove app-android, app-ios, react-app

app-expo/src/constants/layout.ts

@@ -0,0 +1,20 @@
+import { Platform } from 'react-native';
+
+import tokens from '../../design-tokens.json';
+
+export const Layout = tokens.layout;
+
+export const MaxContentWidth = tokens.layout.contentMaxWidth;
+export const ScreenGutter = tokens.layout.screenGutter;
+
+/** Mobile-first breakpoints (px). Use with useBreakpoint or useWindowDimensions. */
+export const Breakpoints = tokens.layout.breakpoints as {
+  sm: number;
+  md: number;
+  lg: number;
+  xl: number;
+  '2xl': number;
+};
+
+// App shell env/config, not design tokens.
+export const BottomTabInset = Platform.select({ ios: 50, android: 80 }) ?? 0;