KI-Chat: Verlauf wird beim Laden angezeigt + einzelne Chats löschbar

- initialMessages-JSON wurde mit <%= %> HTML-escaped, wodurch JSON.parse
  fehlschlug und die Nachrichtenfläche beim Öffnen eines Verlaufs leer blieb.
  Jetzt <%- %> mit < -> < escapet, JSON bleibt parsebar.
- Pro Verlauf ein Trash-Button in der Sidebar (DELETE /chat/api/threads/:id).
  Löscht den Verlauf, entfernt die Zeile, setzt bei aktivem Verlauf auf
  neuen Chat zurück. Auch für client-seitig neu angelegte Threads.

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

public/js/chat.js

@@ -137,10 +137,21 @@
     const empty = threadList.querySelector('li.text-center');
     if (empty) empty.remove();
     const li = document.createElement('li');
-    li.innerHTML = '<a href="/chat?thread=' + encodeURIComponent(id) + '" data-thread="' + id +
+    li.setAttribute('data-thread-li', id);
-      '" class="block px-3 py-2 text-sm text-gray-700 dark:text-gray-200 hover:bg-gray-50 dark:hover:bg-gray-700/40">' +
+    li.innerHTML =
-      '<div class="truncate font-medium">' + escapeHtml(titel || '(neuer Chat)') + '</div>' +
+      '<div class="flex items-center group">' +
-      '<div class="text-[11px] text-gray-400">gerade</div></a>';
+        '<a href="/chat?thread=' + encodeURIComponent(id) + '" data-thread="' + id +
+          '" class="threadLink flex-1 min-w-0 px-3 py-2 text-sm text-gray-700 dark:text-gray-200 hover:bg-gray-50 dark:hover:bg-gray-700/40">' +
+          '<div class="truncate font-medium">' + escapeHtml(titel || '(neuer Chat)') + '</div>' +
+          '<div class="text-[11px] text-gray-400">gerade</div>' +
+        '</a>' +
+        '<button type="button" data-delete-thread="' + id +
+          '" class="threadDelete shrink-0 mr-2 p-1.5 rounded text-gray-400 hover:text-red-600 hover:bg-red-50 dark:hover:bg-red-900/30 opacity-0 group-hover:opacity-100 focus:opacity-100" title="Verlauf löschen" aria-label="Verlauf löschen">' +
+          '<svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">' +
+            '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6M1 7h22M9 7V4a1 1 0 011-1h4a1 1 0 011 1v3"></path>' +
+          '</svg>' +
+        '</button>' +
+      '</div>';
     threadList.insertBefore(li, threadList.firstChild);
   }
 
@@ -284,6 +295,37 @@
     newThreadBtn.addEventListener('click', resetToNewChat);
   }
 
+  // Delete a thread from the sidebar. Event delegation: works for server-rendered
+  // rows and ones added client-side (prependThread).
+  if (threadList) {
+    threadList.addEventListener('click', async (e) => {
+      const btn = e.target.closest('[data-delete-thread]');
+      if (!btn) return;
+      e.preventDefault();
+      e.stopPropagation();
+      const id = Number(btn.getAttribute('data-delete-thread'));
+      if (!id || !confirm('Diesen Chat-Verlauf wirklich löschen?')) return;
+      try {
+        const res = await fetch('/chat/api/threads/' + id, { method: 'DELETE' });
+        if (!res.ok) throw new Error('Löschen fehlgeschlagen (' + res.status + ')');
+      } catch (err) {
+        alert(err.message);
+        return;
+      }
+      const li = threadList.querySelector('li[data-thread-li="' + id + '"]');
+      if (li) li.remove();
+      // If the deleted thread was active, start a fresh chat.
+      if (activeId === id) resetToNewChat();
+      // If no threads remain, show the empty placeholder.
+      if (!threadList.querySelector('li[data-thread-li]')) {
+        const empty = document.createElement('li');
+        empty.className = 'px-3 py-4 text-sm text-gray-400 text-center';
+        empty.textContent = 'Noch keine Verläufe.';
+        threadList.appendChild(empty);
+      }
+    });
+  }
+
   // Render any pre-loaded messages (existing thread) with the same renderer.
   function renderInitial() {
     const blob = document.getElementById('initialMessages');

views/chat.ejs

@@ -43,13 +43,22 @@
                 <div class="px-3 py-2 text-xs font-semibold uppercase tracking-wide text-gray-500 dark:text-gray-400 border-b border-gray-200 dark:border-gray-700">Verläufe</div>
                 <ul id="threadList" class="overflow-y-auto flex-1 divide-y divide-gray-100 dark:divide-gray-700">
                     <% threads.forEach(function(t) { %>
-                        <li>
+                        <li data-thread-li="<%= t.id %>">
-                            <a href="/chat?thread=<%= t.id %>"
+                            <div class="flex items-center group <%= (t.id === activeId) ? 'bg-blue-50 dark:bg-gray-700' : '' %>">
-                               data-thread="<%= t.id %>"
+                                <a href="/chat?thread=<%= t.id %>"
-                               class="threadLink block px-3 py-2 text-sm text-gray-700 dark:text-gray-200 hover:bg-gray-50 dark:hover:bg-gray-700/40 <%= (t.id === activeId) ? 'bg-blue-50 dark:bg-gray-700' : '' %>">
+                                   data-thread="<%= t.id %>"
-                                <div class="truncate font-medium"><%= t.titel || '(ohne Titel)' %></div>
+                                   class="threadLink flex-1 min-w-0 px-3 py-2 text-sm text-gray-700 dark:text-gray-200 hover:bg-gray-50 dark:hover:bg-gray-700/40">
-                                <div class="text-[11px] text-gray-400"><%= new Date(t.updated_at).toLocaleDateString('de-DE') %></div>
+                                    <div class="truncate font-medium"><%= t.titel || '(ohne Titel)' %></div>
-                            </a>
+                                    <div class="text-[11px] text-gray-400"><%= new Date(t.updated_at).toLocaleDateString('de-DE') %></div>
+                                </a>
+                                <button type="button" data-delete-thread="<%= t.id %>"
+                                    class="threadDelete shrink-0 mr-2 p-1.5 rounded text-gray-400 hover:text-red-600 hover:bg-red-50 dark:hover:bg-red-900/30 opacity-0 group-hover:opacity-100 focus:opacity-100"
+                                    title="Verlauf löschen" aria-label="Verlauf löschen">
+                                    <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6M1 7h22M9 7V4a1 1 0 011-1h4a1 1 0 011 1v3"></path>
+                                    </svg>
+                                </button>
+                            </div>
                         </li>
                     <% }); %>
                     <% if (!threads.length) { %>
@@ -80,7 +89,7 @@
         </div>
     </main>
 
-    <script id="initialMessages" type="application/json"><%= JSON.stringify(messages.map(function(m){ return { role: m.role, content: m.content }; })) %></script>
+    <script id="initialMessages" type="application/json"><%- JSON.stringify(messages.map(function(m){ return { role: m.role, content: m.content }; })).replace(/</g, '\\u003c') %></script>
     <input type="hidden" id="activeThread" value="<%= activeId || '' %>">
 
     <script>