fix: hide modal header when no title for ONLYOFFICE editor

static/app.js

@@ -656,12 +656,14 @@ document.getElementById('chat-input')?.addEventListener('keypress', e => {
 // ============================================================
 function showModal(body, title, size = '') {
   const overlay = document.getElementById('modal-overlay');
-  overlay.innerHTML = `
-    <div class="modal" style="${size === 'large' ? 'max-width:1000px' : ''}">
+  const headerHTML = title ? `
       <div class="modal-header">
         <h2>${title}</h2>
         <button class="modal-close" onclick="closeModal()">&times;</button>
-      </div>
+      </div>` : '';
+  overlay.innerHTML = `
+    <div class="modal" style="${size === 'large' ? 'max-width:1000px' : ''}">
+      ${headerHTML}
       <div>${body}</div>
     </div>
   `;

static/carbone.js

@@ -285,7 +285,7 @@ async function openOnlyofficeEditor(templateId, templateName) {
       <div id="onlyoffice-editor-container" style="width:100%;height:600px;border:1px solid var(--border);border-radius:8px;overflow:hidden"></div>
       <p class="text-muted text-sm mt-8">Changes are saved automatically. Click "Save" to force-save, or "Close Editor" to return to the template list.</p>
     `;
-    showModal(body, 'ONLYOFFICE Template Editor', 'large');
+    showModal(body, '', 'large');
 
     // Load ONLYOFFICE API script dynamically
     const scriptUrl = onlyofficeUrl + '/web-apps/apps/api/documents/api.js';