fix(build): add @use sass:color, remove unused MatDialogTitle import

- family-members-tab.scss: add @use 'sass:color' so color.adjust() resolves at build time
- enroll-dsc-dialog: remove MatDialogTitle from imports — not used in template

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/users/dsc/enroll-dsc-dialog/enroll-dsc-dialog.component.ts

@@ -7,7 +7,7 @@
  */
 
 import { Component, OnDestroy, ViewChild, inject } from '@angular/core';
-import { MatDialogRef, MatDialogTitle, MatDialogContent, MatDialogActions } from '@angular/material/dialog';
+import { MatDialogRef, MatDialogContent, MatDialogActions } from '@angular/material/dialog';
 import { MatStepper, MatStep, MatStepLabel } from '@angular/material/stepper';
 import { MatButton } from '@angular/material/button';
 import { MatProgressSpinner } from '@angular/material/progress-spinner';
@@ -24,7 +24,6 @@ import { BankUserDsc, DscEnrollSession } from '../dsc.model';
   styleUrls: ['./enroll-dsc-dialog.component.scss'],
   imports: [
     ...STANDALONE_SHARED_IMPORTS,
-    MatDialogTitle,
     MatDialogContent,
     MatDialogActions,
     MatStepper,