feat(cashier): add Cash/Clearing/Transfer summary report with branch-wise drill-down

Adds a dummy-data summary report (Opening/Credit/Debit/Closing) under Sub
Ledger > Cash / Clearing / Transfer, with Cash, Transfer (GL-wise), Clearing
and Digital (RTGS/NEFT/UPI/ATM/NACH) tabs plus a transaction-details drill
down. Credit/Debit/Closing are always derived from the transaction lines so
the summary and detail views can never drift apart.

Head Office logins (officeId 1 or office name containing "head office") get
a branch switcher across two demo branches plus a consolidated view with a
branch-wise break-up; branch-level logins see only their own office's data.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/core/authentication/authentication.service.ts

@@ -424,6 +424,18 @@ export class AuthenticationService {
     return roleNames.some((n) => n === 'cashier');
   }
 
+  /**
+   * Returns true when the logged-in user belongs to the Head Office.
+   * Fineract seeds Head Office as officeId 1 with hierarchy "."; office name is
+   * checked too since some deployments rename/reseed the root office.
+   */
+  isHeadOfficeUser(): boolean {
+    const creds = this.getCredentials();
+    if (!creds) return false;
+    if (creds.officeId === 1) return true;
+    return (creds.officeName || '').toLowerCase().includes('head office');
+  }
+
   /**
    * Sets the user credentials.
    *