Frontend style refactoring

wwwroot/js/pages/session-page.js

@@ -38,7 +38,7 @@ registerPage('session', {
       workspaceEl.value = session.workspace || '';
       _sessionImageData = session.image || null;
       deleteBtn.hidden = false;
-      openChatBtn.hidden = false;
+      openChatBtn.disabled = false;
 
       if (session.image) {
         imagePreview.innerHTML = `<img src="${session.image}" alt="">`;
@@ -46,7 +46,7 @@ registerPage('session', {
     } else {
       titleEl.textContent = 'Neue Session';
       deleteBtn.hidden = true;
-      openChatBtn.hidden = true;
+      openChatBtn.disabled = true;
     }
 
     // Agents laden