chore: [studio] added some spacing in ai assistant

Author: lvca

studio/src/main/resources/static/ai.html

@@ -11,7 +11,7 @@
   <div id="aiInactivePanel" style="display: none;">
     <div class="d-flex align-items-center justify-content-center" style="height: 70vh;">
       <div class="text-center" style="max-width: 520px;">
-        <i class="fa fa-robot" style="font-size: 3rem; color: var(--color-brand); margin-bottom: 1rem;"></i>
+        <i class="fa fa-robot" style="font-size: 3rem; color: var(--color-brand); margin-top: 2rem; margin-bottom: 1rem;"></i>
         <h4 style="color: var(--text-primary);">AI Assistant</h4>
         <p style="color: var(--text-secondary); margin-top: 1rem;">
           Get AI-powered database assistance: