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

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

frontend/src/components/TopicSidebar.vue

@@ -1,5 +1,6 @@
 <script setup>
 import { ref, computed } from 'vue'
+import { useConfirm } from '../composables/useConfirm.js'
 
 const props = defineProps({
   topics: { type: Array, required: true },
@@ -63,21 +64,7 @@ const activeGenerations = computed(() => {
   return [...bausteinLines, ...guideLines]
 })
 
-// Inline-Bestätigung statt confirm(): erster Klick scharfschalten („Sicher?"),
-// zweiter Klick führt aus. Browser-Dialoge können unterdrückt sein (Firefox).
-const pendingConfirm = ref(null)
-let confirmTimer = null
-
-function armOrRun(key, action) {
-  clearTimeout(confirmTimer)
-  if (pendingConfirm.value === key) {
-    pendingConfirm.value = null
-    action()
-  } else {
-    pendingConfirm.value = key
-    confirmTimer = setTimeout(() => { pendingConfirm.value = null }, 3000)
-  }
-}
+const { pending: pendingConfirm, armOrRun } = useConfirm()
 
 function confirmCancelBausteine() {
   armOrRun('bausteine', () => emit('cancelBausteine'))