fix: null quiz crash in admin candidate show - load attempts.quiz withoutGlobalScopes + null guard in Vue template

app/Http/Controllers/CandidateController.php

@@ -81,13 +81,23 @@ class CandidateController extends Controller
         $candidate->load([
             'user', 
             'documents', 
-            'attempts.quiz', 
-            'attempts.answers.question',
-            'attempts.answers.option',
             'jobPosition',
             'tenant'
         ]);
 
+        // Load attempts with quiz bypassing tenant scope
+        // (admin may view candidates whose quizzes belong to other tenants)
+        $candidate->setRelation(
+            'attempts',
+            $candidate->attempts()
+                ->with([
+                    'quiz' => fn($q) => $q->withoutGlobalScopes(),
+                    'answers.question',
+                    'answers.option',
+                ])
+                ->get()
+        );
+
         $data = [
             'candidate' => $candidate,
             'jobPositions' => \App\Models\JobPosition::all(),