Initial commit: Expo app with Better Auth integration

- Complete Expo React Native app setup with TypeScript
- Better Auth authentication system integration
- Secure storage implementation for session tokens
- Authentication flow with login/logout functionality
- API client configuration for backend communication
- Responsive UI components with themed styling
- Expo Router navigation setup
- Development configuration and scripts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/ui/icon-symbol.ios.tsx

@@ -0,0 +1,32 @@
+import { SymbolView, SymbolViewProps, SymbolWeight } from 'expo-symbols';
+import { StyleProp, ViewStyle } from 'react-native';
+
+export function IconSymbol({
+  name,
+  size = 24,
+  color,
+  style,
+  weight = 'regular',
+}: {
+  name: SymbolViewProps['name'];
+  size?: number;
+  color: string;
+  style?: StyleProp<ViewStyle>;
+  weight?: SymbolWeight;
+}) {
+  return (
+    <SymbolView
+      weight={weight}
+      tintColor={color}
+      resizeMode="scaleAspectFit"
+      name={name}
+      style={[
+        {
+          width: size,
+          height: size,
+        },
+        style,
+      ]}
+    />
+  );
+}