feat(savings,deposits,current-accounts): streamline account activation flow

Matches the backend change that stopped auto-depositing money at
activation: removes the opening-balance field from every Activate
screen (Savings, Current, FD, RD) since funding now happens as a
separate deposit afterward, and removes the Digital-Facility step from
every Create wizard since every facility starts disabled by default
and gets turned on later through Edit Nominee & Features.

Also merges Approve+Activate into a single action for Savings,
Current, FD and RD accounts -- one click takes the account straight to
Active instead of two separate screens.

src/app/savings/create-savings-account/create-savings-account.component.ts

@@ -62,8 +62,8 @@ export class CreateSavingsAccountComponent {
   savingsAccountProductTemplate: any;
   /** Currently visible wizard tab (0-indexed). */
   selectedTabIndex = 0;
-  /** Total wizard tabs — Product, Currency, Digital, Preview. */
-  private readonly totalTabs = 4;
+  /** Total wizard tabs — Product, Currency, Preview. */
+  private readonly totalTabs = 3;
   /** Guards against duplicate submissions from a double-click while the create request is in flight. */
   submitting = false;