Fix pharmacy Call next to FIFO shared pool with one patient per counter.

Pharmacy/lab/billing now use a shared waiting pool claimed in order on Call next. A counter cannot stack another called ticket while one is already called or being served, so pharmacists no longer pull randomly or multiple patients at once.

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

app/Services/Qms/QueueEngine.php

@@ -101,6 +101,27 @@ class QueueEngine
 
     public function callNext(ServiceQueue $queue, Counter $counter, ?string $actorRef = null): ?Ticket
     {
+        // One patient at a time per service point: finish serving before calling another.
+        $activeServing = Ticket::query()
+            ->where('service_queue_id', $queue->id)
+            ->where('counter_id', $counter->id)
+            ->where('status', 'serving')
+            ->exists();
+        if ($activeServing) {
+            return null;
+        }
+
+        // Already called someone at this counter — re-announce instead of stacking another patient.
+        $alreadyCalled = Ticket::query()
+            ->where('service_queue_id', $queue->id)
+            ->where('counter_id', $counter->id)
+            ->where('status', 'called')
+            ->orderByDesc('called_at')
+            ->first();
+        if ($alreadyCalled) {
+            return $this->recall($alreadyCalled, $actorRef);
+        }
+
         $ticket = $this->nextWaitingTicket($queue, $counter);
         if (! $ticket) {
             return null;
@@ -111,14 +132,18 @@ class QueueEngine
 
     public function callTicket(Ticket $ticket, Counter $counter, ?string $actorRef = null): Ticket
     {
-        if ($ticket->assigned_counter_id && (int) $ticket->assigned_counter_id !== (int) $counter->id) {
+        $ticket->loadMissing('serviceQueue');
+        $queue = $ticket->serviceQueue;
+        if ($queue?->usesAssignedOnlyRouting()
+            && $ticket->assigned_counter_id
+            && (int) $ticket->assigned_counter_id !== (int) $counter->id) {
             throw new \RuntimeException('Ticket is assigned to another service point.');
         }
 
         $ticket->update([
             'status' => 'called',
             'counter_id' => $counter->id,
-            'assigned_counter_id' => $ticket->assigned_counter_id ?: $counter->id,
+            'assigned_counter_id' => $counter->id,
             'called_at' => now(),
         ]);
 
@@ -402,7 +427,8 @@ class QueueEngine
             ->where('service_queue_id', $queue->id)
             ->where('status', 'waiting')
             ->orderByRaw($this->priorityOrderSql())
-            ->orderBy('issued_at');
+            ->orderBy('issued_at')
+            ->orderBy('id');
 
         if (! $counter) {
             return $query;
@@ -412,10 +438,9 @@ class QueueEngine
             return $query->where('assigned_counter_id', $counter->id);
         }
 
-        return $query->where(function ($q) use ($counter) {
-            $q->whereNull('assigned_counter_id')
-                ->orWhere('assigned_counter_id', $counter->id);
-        });
+        // Shared pool (pharmacy, bank tellers, etc.): FIFO across the whole queue.
+        // Prior counter assignment does not block another desk from claiming the next waiting ticket.
+        return $query;
     }
 
     /**