new: add a link to public article page from article and offres admin edit form

resources/views/Admin/Shop/Articles/form.blade.php

@@ -5,6 +5,25 @@
     'files' => true,
 ]) }}
 <input type="hidden" name="id" id="id" value="{{ $article['id'] ?? null }}">
+
+@php
+    $articlePublicUrl = null;
+    if (!empty($article['slug'] ?? null)) {
+        $articlePublicUrl = route('Shop.Articles.slug', ['slug' => $article['slug']]);
+    } elseif (!empty($article['id'] ?? null)) {
+        $articlePublicUrl = route('Shop.Articles.show', ['id' => $article['id']]);
+    }
+@endphp
+
+@if ($articlePublicUrl)
+    <div class="d-flex justify-content-end mb-3">
+        <a href="{{ $articlePublicUrl }}" class="btn btn-outline-primary" target="_blank" rel="noopener">
+            Voir la page publique
+            <i class="fa fa-external-link"></i>
+        </a>
+    </div>
+@endif
+
 @include('Admin.Shop.Articles.partials.characteristics')
 {{ Form::close() }}