Make cashier billing invoices actionable for walk-up payment.

Clarify booth Call next vs unpaid invoice list, and expose Pay/View row actions so cashiers can open bills when the booth queue is empty.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Http/Controllers/Care/BillController.php

@@ -89,7 +89,10 @@ class BillController extends Controller
         $result = $this->queueBridge->callNext($organization, CareQueueContexts::BILLING, $branchId, $member);
         $ticket = $result['ticket'] ?? null;
         if (! $ticket) {
-            return back()->with('info', 'No bills waiting at your billing service point.');
+            return back()->with(
+                'info',
+                'No patients waiting at the billing booth. Open an unpaid invoice below to record a walk-up payment.',
+            );
         }
 
         return back()->with('success', 'Called '.$ticket['ticket_number'].'.');