[PM-30845] fix(vault): preserve card brand when editing existing card (#18381)

* fix(vault): preserve card brand when editing existing card

Fixes #16978

The brand field was not being restored when editing an existing card
cipher, causing it to show '--Select--' and potentially lose the brand
data when saving.

Added the brand field to initFromExistingCipher() to properly restore
the card brand when opening a card for editing.

Also updated the test to verify all card fields including brand, expMonth,
and expYear are properly initialized from existing cipher data.

* fix: add brand to OptionalInitialValues interface

Addresses review feedback from @jengstrom-bw in PR #18381.
The brand field was being used in card-details-section.component.ts
but wasn't defined in the OptionalInitialValues type, causing a
TypeScript compilation error.

Adds brand?: string; to the Credit Card Information section of
OptionalInitialValues in cipher-form-config.service.ts.

* test: add coverage for initFromExistingCipher brand logic

libs/vault/src/cipher-form/abstractions/cipher-form-config.service.ts

@@ -28,6 +28,7 @@ export type OptionalInitialValues = {
   // Credit Card Information
   cardholderName?: string;
   number?: string;
+  brand?: string;
   expMonth?: string;
   expYear?: string;
   code?: string;

libs/vault/src/cipher-form/components/card-details-section/card-details-section.component.spec.ts

@@ -108,12 +108,17 @@ describe("CardDetailsSectionComponent", () => {
     const cardholderName = "Ron Burgundy";
     const number = "4242 4242 4242 4242";
     const code = "619";
+    const brand = "Maestro";
+    const expMonth = "5";
+    const expYear = "2028";
 
     const cardView = new CardView();
     cardView.cardholderName = cardholderName;
     cardView.number = number;
     cardView.code = code;
-    cardView.brand = "Visa";
+    cardView.brand = brand;
+    cardView.expMonth = expMonth;
+    cardView.expYear = expYear;
 
     getInitialCipherView.mockReturnValueOnce({ card: cardView });
 
@@ -123,7 +128,9 @@ describe("CardDetailsSectionComponent", () => {
       cardholderName,
       number,
       code,
-      brand: cardView.brand,
+      brand,
+      expMonth,
+      expYear,
     });
   });
 
@@ -154,4 +161,27 @@ describe("CardDetailsSectionComponent", () => {
 
     expect(heading.nativeElement.textContent.trim()).toBe("cardDetails");
   });
+
+  it("initializes `cardDetailsForm` from `initialValues` when provided and editing existing cipher", () => {
+    const initialCardholderName = "New Name";
+    const initialBrand = "Amex";
+
+    (cipherFormProvider as any).config = {
+      initialValues: {
+        cardholderName: initialCardholderName,
+        brand: initialBrand,
+      },
+    };
+
+    const existingCard = new CardView();
+    existingCard.cardholderName = "Old Name";
+    existingCard.brand = "Visa";
+
+    getInitialCipherView.mockReturnValueOnce({ card: existingCard });
+
+    component.ngOnInit();
+
+    expect(component.cardDetailsForm.value.cardholderName).toBe(initialCardholderName);
+    expect(component.cardDetailsForm.value.brand).toBe(initialBrand);
+  });
 });

libs/vault/src/cipher-form/components/card-details-section/card-details-section.component.ts

@@ -158,6 +158,7 @@ export class CardDetailsSectionComponent implements OnInit {
     this.cardDetailsForm.patchValue({
       cardholderName: this.initialValues?.cardholderName ?? existingCard.cardholderName,
       number: this.initialValues?.number ?? existingCard.number,
+      brand: this.initialValues?.brand ?? existingCard.brand,
       expMonth: this.initialValues?.expMonth ?? existingCard.expMonth,
       expYear: this.initialValues?.expYear ?? existingCard.expYear,
       code: this.initialValues?.code ?? existingCard.code,