Set up custom breadcrumb view for admin panel

- Add `breadcrumbs/admin.blade.php` to define admin-specific breadcrumb structure.
- Update `Admin/Controller` to use the new breadcrumb view.

app/application/app/Http/Controllers/Admin/Controller.php

@@ -9,6 +9,6 @@ abstract class Controller extends BaseController
 {
     public function __construct()
     {
-        Config::set('breadcrumbs.view', 'breadcrumbs::bootstrap4');
+        Config::set('breadcrumbs.view', 'breadcrumbs.admin');
     }
 }

app/application/resources/views/breadcrumbs/admin.blade.php

@@ -0,0 +1,25 @@
+@unless ($breadcrumbs->isEmpty())
+    <nav aria-label="breadcrumb" class="d-none d-md-inline-block">
+        <ol class="breadcrumb breadcrumb-dark breadcrumb-transparent">
+            @foreach ($breadcrumbs as $breadcrumb)
+                @if ($breadcrumb->url && !$loop->last)
+                    <li class="breadcrumb-item"><a href="{{ $breadcrumb->url }}" aria-label="{{ $breadcrumb->title }}">
+                        @if(!empty($breadcrumb->icon))
+                            {!! $breadcrumb->icon !!}
+                        @else
+                            {{ $breadcrumb->title }}
+                        @endif
+                    </a></li>
+                @else
+                    <li class="breadcrumb-item active" aria-current="page">
+                        @if(!empty($breadcrumb->icon))
+                            {!! $breadcrumb->icon !!}
+                        @else
+                            {{ $breadcrumb->title }}
+                        @endif
+                    </li>
+                @endif
+            @endforeach
+        </ol>
+    </nav>
+@endunless