feat: Expo scaffold + auth screens + core screens (#39-#46, #48)

components/AppCard.tsx

@@ -0,0 +1,31 @@
+import React from 'react';
+import { View, ViewProps } from 'react-native';
+
+interface AppCardProps extends ViewProps {
+  children: React.ReactNode;
+  className?: string;
+  padding?: 'sm' | 'md' | 'lg' | 'none';
+}
+
+export const AppCard: React.FC<AppCardProps> = ({
+  children,
+  className = '',
+  padding = 'md',
+  ...props
+}) => {
+  const paddingClasses = {
+    none: '',
+    sm: 'p-3',
+    md: 'p-4',
+    lg: 'p-6',
+  };
+
+  return (
+    <View
+      className={`bg-white rounded-2xl shadow-sm border border-gray-100 ${paddingClasses[padding]} ${className}`}
+      {...props}
+    >
+      {children}
+    </View>
+  );
+};