Initial commit: family safety frontend project setup

lib/utils/constants.dart

@@ -0,0 +1,11 @@
+class AppConstants {
+  static const String appName = 'Family Safety';
+  static const String defaultMapsApiKey = 'YOUR_MAPS_API_KEY';
+  
+  // Default coordinates (Moscow)
+  static const double defaultLatitude = 55.7558;
+  static const double defaultLongitude = 37.6173;
+  
+  // Share link expiration (5 minutes in seconds)
+  static const int shareExpirationSeconds = 300;
+}

lib/utils/string_utils.dart

@@ -0,0 +1,22 @@
+
+class StringUtil {
+  static bool isValidEmail(String email) {
+    final regExp = RegExp(r'^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)*\.(\w+)$');
+    return regExp.hasMatch(email);
+  }
+  
+  static String truncate(String text, int maxLength) {
+    if (text.length <= maxLength) return text;
+    return '${text.substring(0, maxLength)}...';
+  }
+  
+  static String formatDateTime(String dateTime) {
+    try {
+      final date = DateTime.parse(dateTime);
+      return '${date.day}/${date.month}/${date.year} '
+             '${date.hour}:${date.minute.toString().padLeft(2, '0')}';
+    } catch (e) {
+      return dateTime;
+    }
+  }
+}