add user deletion, email change

lib/BlindMasterScreens/Startup/email_change_waiting_screen.dart

@@ -0,0 +1,73 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:blind_master/BlindMasterResources/secure_transmissions.dart';
+import 'package:flutter/material.dart';
+import '../email_verification_waiting_screen.dart';
+
+class EmailChangeWaitingScreen extends BaseVerificationWaitingScreen {
+  final String newEmail;
+  
+  const EmailChangeWaitingScreen({super.key, required this.newEmail});
+
+  @override
+  State<EmailChangeWaitingScreen> createState() => _EmailChangeWaitingScreenState();
+}
+
+class _EmailChangeWaitingScreenState extends BaseVerificationWaitingScreenState<EmailChangeWaitingScreen> {
+  @override
+  String get title => "Verify New Email";
+
+  @override
+  String get mainMessage => "We've sent a verification link to:";
+
+  @override
+  String? get highlightedInfo => widget.newEmail;
+
+  @override
+  String get instructionMessage => "Click the link in the email to verify your new email address. This page will automatically update once verified.";
+
+  @override
+  String get successMessage => "Email changed successfully!";
+
+  @override
+  Future<bool> checkStatus() async {
+    final response = await secureGet('pending-email-status');
+    
+    if (response == null) {
+      throw Exception('No response from server');
+    }
+    
+    if (response.statusCode == 200) {
+      final body = json.decode(response.body);
+      return body['hasPending'] == false;
+    }
+    return false;
+  }
+
+  @override
+  Future<void> resendVerification() async {
+    final localHour = DateTime.now().hour;
+    final response = await securePost(
+      {
+        'newEmail': widget.newEmail,
+        'localHour': localHour,
+      },
+      'request-email-change',
+    );
+    
+    if (response == null) {
+      throw Exception('No response from server');
+    }
+    
+    if (response.statusCode != 200) {
+      final body = json.decode(response.body);
+      throw Exception(body['error'] ?? 'Failed to resend verification email');
+    }
+  }
+
+  @override
+  void onSuccess() {
+    Navigator.of(context).pop(true); // Return true to indicate success
+  }
+}