Fix: collect payment wizard reads participant UUID from query string

Livewire mount() doesn't automatically receive query params unless the
route defines them. Added request()->query('participant') fallback so
the "جدّد" button from overdue renewals alert correctly pre-fills the
participant and skips to step 2.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Livewire/Receptionist/CollectPaymentWizard.php

@@ -56,8 +56,10 @@ public function mount(?string $participant = null): void
         $this->authorize('invoices.create');
         $this->branchId = $this->getActiveBranchIdOrFail();
 
-        if ($participant) {
-            $p = Participant::with('person')->where('uuid', $participant)->first();
+        $participantUuid = $participant ?? request()->query('participant');
+
+        if ($participantUuid) {
+            $p = Participant::with('person')->where('uuid', $participantUuid)->first();
             if ($p) {
                 $this->selected_participant_id = $p->id;
                 $this->selected_participant_name = $p->person?->name_ar ?? $p->person?->name ?? '';