feat/ Remove side panel for file browsing from chat interface

chat-interface-block.html

@@ -16,15 +16,6 @@
             <!-- Particles will be added dynamically -->
         </div>
         
-        <!-- Side panel for file browsing -->
-        <div class="file-panel">
-            <div class="file-panel-header">Available Files</div>
-            <ul class="file-list" id="file-list">
-                <!-- Files will be populated via JavaScript -->
-                <li class="file-item"><span class="file-icon">📄</span>Loading files...</li>
-            </ul>
-        </div>
-        
         <!-- Main content area -->
         <div class="main-content">
             <div class="greeting">Welcome to <span>Ontology Generation Assistant</span></div>