fix: show general panel by default on company create form

panel-general had class tab-panel (display:none) but showTab('general')
was only called in edit mode — so new company form showed no fields.
Adding active class as default makes it visible immediately.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin/DashboardController.php

@@ -1247,7 +1247,7 @@ HTML : '';
   {$tabsHtml}
 
   <!-- Tab General -->
-  <div id="panel-general" class="tab-panel">
+  <div id="panel-general" class="tab-panel active">
     <div class="card">
       <div class="card-b">
         <form method="POST" action="/admin/company/save">