chore: remove unused Expo template files and dependencies, add CI workflow

- 17 files unreferenced by the app (knip): hello-wave, parallax-scroll-view, themed-*, icon-symbol, Button, GlassCard, ScreenWrapper, Models catalog, duplicated theme/color-scheme hooks
- scripts/reset-project.js and its npm script: it moves app/ to app-example and would wipe the project
- dependencies only used by those files: expo-image, expo-symbols, expo-web-browser, react-native-sse, @babel/plugin-transform-runtime
- GitHub Actions workflow running typecheck, lint, tests and the web export

hooks/use-color-scheme.ts

@@ -1 +0,0 @@
-export { useColorScheme } from 'react-native';

hooks/use-color-scheme.web.ts

@@ -1,21 +0,0 @@
-import { useEffect, useState } from 'react';
-import { useColorScheme as useRNColorScheme } from 'react-native';
-
-/**
- * To support static rendering, this value needs to be re-calculated on the client side for web
- */
-export function useColorScheme() {
-  const [hasHydrated, setHasHydrated] = useState(false);
-
-  useEffect(() => {
-    setHasHydrated(true);
-  }, []);
-
-  const colorScheme = useRNColorScheme();
-
-  if (hasHydrated) {
-    return colorScheme;
-  }
-
-  return 'light';
-}

hooks/use-theme-color.ts

@@ -1,21 +0,0 @@
-/**
- * Learn more about light and dark modes:
- * https://docs.expo.dev/guides/color-schemes/
- */
-
-import { Colors } from '@/constants/theme';
-import { useColorScheme } from '@/hooks/use-color-scheme';
-
-export function useThemeColor(
-  props: { light?: string; dark?: string },
-  colorName: keyof typeof Colors.light & keyof typeof Colors.dark
-) {
-  const theme = useColorScheme() ?? 'light';
-  const colorFromProps = props[theme];
-
-  if (colorFromProps) {
-    return colorFromProps;
-  } else {
-    return Colors[theme][colorName];
-  }
-}