feat: account charges UI — current account, FD, RD stepper redesign

Redesigned create-account stepper UI for current accounts, fixed deposits,
and recurring deposits: updated layout, preview steps, interest rate chart
step, currency step, and detail step components. Savings preview styling
and currency step also updated.

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

src/app/savings/savings-account-stepper/savings-account-currency-step/savings-account-currency-step.component.ts

@@ -58,6 +58,13 @@ export class SavingsAccountCurrencyStepComponent {
       this.nomineeError = 'This person is already added as a nominee.';
       return;
     }
+    const relationshipLower = data.relationshipName?.toLowerCase();
+    if (relationshipLower === 'father' || relationshipLower === 'mother' || relationshipLower === 'wife') {
+      if (this.nominees.some((n) => n.relationshipName?.toLowerCase() === relationshipLower)) {
+        this.nomineeError = `Only one ${data.relationshipName} can be added as a nominee.`;
+        return;
+      }
+    }
     const newTotal = this.totalShare + (+data.percentageShare || 0);
     if (newTotal > 100) {
       this.nomineeError = `Total share cannot exceed 100%. Remaining: ${this.remainingShare}%`;

src/app/savings/savings-account-stepper/savings-account-preview-step/savings-account-preview-step.component.scss

@@ -33,6 +33,10 @@
 
   &__primary {
     background: linear-gradient(135deg, #10b981 0%, #047857 100%) !important;
+
+    --mdc-protected-button-container-color: transparent !important;
+    --mdc-filled-button-container-color: transparent !important;
+
     color: #fff !important;
     box-shadow: 0 4px 12px -2px rgb(4 120 87 / 35%) !important;
   }