Frontend: Composables useConfirm/useChat/usePolling; Guide-Chat abbrechbar

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/TopicDetail.vue

@@ -2,6 +2,7 @@
 import { computed, ref, watch, nextTick, onMounted, onUnmounted } from 'vue'
 import { fetchGuideContent, chatGuide, fetchProgress, setProgress } from '../api.js'
 import { renderMarkdown } from '../markdown.js'
+import { useChat } from '../composables/useChat.js'
 
 const props = defineProps({
   previewGuide: { type: Object, default: null },
@@ -72,13 +73,16 @@ async function toggleChapter(title) {
   }
 }
 
-// --- Chat ---
+// --- Chat (Mechanik in useChat; Kontext-Extraktion bleibt hier) ---
+const chat = useChat((msgs) => {
+  const { section, outline } = extractContext()
+  return chatGuide(props.previewGuide.id, {
+    section, outline, messages: msgs, provider: props.provider,
+  })
+})
+const { messages, input, loading, messagesEl, inputEl, send } = chat
+const autoGrow = () => chat.autoGrow()
 const chatOpen = ref(false)
-const messages = ref([])
-const input = ref('')
-const loading = ref(false)
-const messagesEl = ref(null)
-const inputEl = ref(null)
 const panelEl = ref(null)
 
 function openChat() {
@@ -88,8 +92,7 @@ function openChat() {
 
 function closeChat() {
   chatOpen.value = false
-  messages.value = []
-  input.value = ''
+  chat.reset()
 }
 
 function onDocMouseDown(e) {
@@ -141,43 +144,6 @@ function extractContext() {
   return { section, outline }
 }
 
-async function scrollToBottom() {
-  await nextTick()
-  if (messagesEl.value) messagesEl.value.scrollTop = messagesEl.value.scrollHeight
-}
-
-function autoGrow() {
-  const el = inputEl.value
-  if (!el) return
-  el.style.height = 'auto'
-  el.style.height = Math.min(el.scrollHeight, 140) + 'px'
-}
-
-async function send() {
-  const text = input.value.trim()
-  if (!text || loading.value || !props.previewGuide) return
-  messages.value.push({ role: 'user', content: text })
-  input.value = ''
-  nextTick(autoGrow)
-  loading.value = true
-  scrollToBottom()
-  try {
-    const { section, outline } = extractContext()
-    const res = await chatGuide(props.previewGuide.id, {
-      section,
-      outline,
-      messages: messages.value,
-      provider: props.provider,
-    })
-    messages.value.push({ role: 'assistant', content: res.reply || '…' })
-  } catch {
-    messages.value.push({ role: 'assistant', content: 'Fehler bei der Anfrage.' })
-  } finally {
-    loading.value = false
-    scrollToBottom()
-    nextTick(() => inputEl.value?.focus())
-  }
-}
 </script>
 
 <template>
@@ -250,7 +216,12 @@ async function send() {
           @input="autoGrow"
           @keydown.enter.exact.prevent="send"
         ></textarea>
-        <button :disabled="!input.trim() || loading" @click="send">➤</button>
+        <button
+          :disabled="!input.trim() && !loading"
+          :class="{ cancel: loading }"
+          :title="loading ? 'Abbrechen' : 'Senden'"
+          @click="send"
+        >{{ loading ? '✕' : '➤' }}</button>
       </div>
     </div>
   </div>
@@ -698,4 +669,8 @@ async function send() {
   opacity: 0.4;
   cursor: not-allowed;
 }
+
+.chat-input button.cancel {
+  background: var(--danger);
+}
 </style>