Fix cashier desk: unpaid bills on every demo branch.

Demo seeding used i%3 for both branch and paid status, so Ridge Clinic only got paid invoices. Cashiers now default to outstanding balances and Call next is secondary to the walk-up unpaid list.

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

app/Services/Care/BillService.php

@@ -46,7 +46,11 @@ class BillService
             $query->where('branch_id', $branchId);
         }
 
-        if ($status = $filters['status'] ?? null) {
+        $status = $filters['status'] ?? null;
+        if ($status === 'outstanding') {
+            $query->whereIn('status', [Bill::STATUS_OPEN, Bill::STATUS_PARTIAL])
+                ->where('balance_minor', '>', 0);
+        } elseif ($status) {
             $query->where('status', $status);
         }