Fix: guard null participant in enrollment list to prevent route error

Soft-deleted participants return null from the relationship, causing
route('participants.show', null) to throw a missing parameter exception.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

resources/views/livewire/enrollments/enrollment-list.blade.php

@@ -77,14 +77,18 @@ class="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 f
                     @forelse($enrollments as $enrollment)
                     <tr class="hover:bg-gray-50">
                         <td class="px-4 py-3">
+                            @if($enrollment->participant)
                             <a href="{{ route('participants.show', $enrollment->participant) }}" wire:navigate class="text-blue-600 hover:text-blue-800 hover:underline font-medium">
-                                {{ $enrollment->participant?->person?->name_ar ?? '—' }}
+                                {{ $enrollment->participant->person?->name_ar ?? '—' }}
                             </a>
-                            @if($enrollment->participant?->participant_number)
+                            @if($enrollment->participant->participant_number)
                             <p class="text-xs text-gray-500" dir="ltr">
                                 {{ $enrollment->participant->participant_number }}
                             </p>
                             @endif
+                            @else
+                            <span class="text-gray-400">{{ __('محذوف') }}</span>
+                            @endif
                         </td>
                         <td class="px-4 py-3">
                             <a href="{{ route('groups.edit', $enrollment->group) }}" wire:navigate class="text-gray-700 hover:text-blue-600 hover:underline">
@@ -238,9 +242,13 @@ class="mt-2 text-blue-600 hover:text-blue-800 text-sm font-medium py-2">
             <div class="flex items-start justify-between gap-3 mb-3">
                 <div class="min-w-0 flex-1">
                     <h3 class="truncate">
+                        @if($enrollment->participant)
                         <a href="{{ route('participants.show', $enrollment->participant) }}" wire:navigate class="text-blue-600 hover:text-blue-800 hover:underline font-medium">
-                            {{ $enrollment->participant?->person?->name_ar ?? '—' }}
+                            {{ $enrollment->participant->person?->name_ar ?? '—' }}
                         </a>
+                        @else
+                        <span class="text-gray-400">{{ __('محذوف') }}</span>
+                        @endif
                     </h3>
                     @if($enrollment->participant?->participant_number)
                     <p class="text-xs text-gray-500 mt-0.5" dir="ltr">