feat: DSC enrollment + MFA controls, user CRUD UX, auth error hardening

- DSC module: list/enroll/revoke dialogs and dsc.service (m_bank_user_dsc API)
- Access control: DSC + MFA toggles via disable-confirm-dialog
- Two-factor auth: expanded UX (DSC + OTP flows)
- Users: create/edit form polish, success snackbar on edit, DSC widget
  retained only inside dsc/ (removed from view-user)
- Auth: X-Requested-With added globally; error handler null-safe on
  empty 500 bodies

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/users/create-user/create-user.component.html

@@ -86,7 +86,7 @@
               formControlName="email"
               placeholder="name@example.com"
             />
-            @if (userForm.controls.email.hasError('email')) {
+            @if (userForm.controls.email.hasError('email') || userForm.controls.email.hasError('pattern')) {
               <mat-error
                 >{{ 'labels.inputs.Email' | translate }} {{ 'labels.commons.is' | translate }}
                 <strong>{{ 'labels.commons.invalid' | translate }}</strong></mat-error

src/app/users/create-user/create-user.component.ts

@@ -107,7 +107,8 @@ export class CreateUserComponent implements OnInit, AfterViewInit {
           '',
           [
             Validators.required,
-            Validators.email
+            Validators.email,
+            Validators.pattern(/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/)
           ]
         ],
         mobileNo: [
@@ -169,7 +170,8 @@ export class CreateUserComponent implements OnInit, AfterViewInit {
         this.userForm.removeControl('repeatPassword');
         this.userForm.get('email').setValidators([
           Validators.required,
-          Validators.email
+          Validators.email,
+          Validators.pattern(/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/)
         ]);
       } else {
         this.userForm.addControl('password', new UntypedFormControl('', this.passwordsUtility.getPasswordValidators()));
@@ -180,7 +182,10 @@ export class CreateUserComponent implements OnInit, AfterViewInit {
             this.passwordsUtility.confirmPassword('password')
           ])
         );
-        this.userForm.get('email').setValidators([Validators.email]);
+        this.userForm.get('email').setValidators([
+          Validators.email,
+          Validators.pattern(/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/)
+        ]);
       }
       this.userForm.get('email').updateValueAndValidity();
     });