refactor observers, fix policy, add feature tests

app/Http/Controllers/PublicController.php

@@ -41,6 +41,8 @@ class PublicController extends Controller
     {
         abort_if($activity->status !== 'approved', 404);
 
+        $activity->load('creator', 'participants');
+
         return view('public.kegiatan-detail', compact('activity'));
     }
 
@@ -55,6 +57,8 @@ class PublicController extends Controller
     {
         abort_if($post->status !== 'published' || ! $post->published_at, 404);
 
+        $post->load('author');
+
         return view('public.blog-detail', compact('post'));
     }