add update phone number and recovery email

lib/pages/main/util.dart

@@ -403,3 +403,12 @@ String removeTrailingZeros(double number) {
       : result;
   return result;
 }
+
+
+bool isValidEmail(String email) {
+  // Define a regular expression for validating an email
+  final emailRegex = RegExp(r'^[^@\s]+@[^@\s]+\.[^@\s]+$');
+
+  // Check if the email matches the pattern
+  return emailRegex.hasMatch(email);
+}