feat(clerk): add clerk-facing Cheque Book screen and shell nav wiring

Adds a customer-account-scoped Cheque Book view under Clerk > Account
Facilities (list + leaf detail, with stop-payment/report-lost/mark-used/
return actions), reachable via a new hover dropdown on the Account
Facilities nav item. Also refreshes the Account Facilities page layout,
and carries over a few chequebook service/detail-dialog fixes from the
back-office module (used-leaf display, leaf-lookup dialog polish).

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

src/app/cashier/cashier-routing.module.ts

@@ -70,6 +70,18 @@ const routes: Routes = [
             ),
           data: { title: 'Account Facilities', breadcrumb: 'Account Facilities' }
         },
+        {
+          path: 'account-facilities/cheque-book',
+          loadComponent: () =>
+            import('../clerk/cheque-book/cheque-book.component').then((m) => m.ClerkChequeBookComponent),
+          data: { title: 'Cheque Book', breadcrumb: 'Cheque Book' }
+        },
+        {
+          path: 'account-facilities/cheque-book/:id',
+          loadComponent: () =>
+            import('../clerk/cheque-book/cheque-book-detail.component').then((m) => m.ClerkChequeBookDetailComponent),
+          data: { title: 'Cheque Book Detail', breadcrumb: 'Cheque Book Detail' }
+        },
         {
           path: 'photo-signature',
           loadComponent: () =>