feat(cashier): maker-checker on cash transfer, real branches, compact Approval Center

- Cash Transfer now raises a request ("Send for approval") instead of posting. A My Requests button in the
  page header opens the caller's requests with their status, and a Cash Transfers approvals page (review
  popup with the full denomination breakdown, approve, reject with a reason) lets a different manager release
  the cash.
- Transaction Entry's Branch dropdown lists the installation's real offices instead of a fixed list. A login
  that cannot read offices is offered only its own branch (read-only), so no "Unauthorized Request" popup.
- Approval Center header and tab bar made compact so more tabs fit on a 100% window.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/app/cashier/cashier.service.ts

@@ -47,8 +47,21 @@ export class CashierService {
   }
 
   // ── Cash Transfer ──
-  createCashTransfer(data: any): Observable<any> {
-    return this.http.post('/cashtransfer', data);
+  /** Cash leaves the vault only when a different person approves, so the screen raises a request, not a transfer. */
+  createCashTransferRequest(data: any): Observable<any> {
+    return this.http.post('/cashtransfer/requests', data);
+  }
+  /** Requests by status (comma separated); mine narrows them to the ones the caller raised. */
+  getCashTransferRequests(status?: string, mine = false): Observable<any[]> {
+    let params = new HttpParams().set('mine', String(mine));
+    if (status) params = params.set('status', status);
+    return this.http.get<any[]>('/cashtransfer/requests', { params });
+  }
+  approveCashTransferRequest(id: number): Observable<any> {
+    return this.http.post(`/cashtransfer/requests/${id}/approve`, {});
+  }
+  rejectCashTransferRequest(id: number, reason: string): Observable<any> {
+    return this.http.post(`/cashtransfer/requests/${id}/reject`, { reason });
   }
   getCashTransfers(offset = 0, limit = 20): Observable<any> {
     const params = new HttpParams().set('offset', offset).set('limit', limit);