feat(registration): fixed registration on android devices, feat(leaders): fixed diet creation loader

lib/features/registration_v2/presentation/widgets/password_field.dart

@@ -42,6 +42,7 @@ class _PasswordFieldState extends State<PasswordField> {
                               copied = true;
                             });
                             Future.delayed(const Duration(seconds: 3), () {
+                              if (!context.mounted) return;
                               setState(() {
                                 copied = false;
                               });