feat: F025 button & action logic audit — global toast, confirm dialog, wired mutations

- Add ToastProvider (global MUI Snackbar stack) + toastStore (Zustand)
- Add ConfirmDialog reusable component for destructive actions
- Wire toast feedback to all async mutations: review status, AI output status,
  match approval, shortlist add/remove/title/finalize, signal review actions
- Fix dead UserMenu buttons (Profil, Einstellungen) — show info toast
- Migrate local Snackbar instances in AddToShortlistDialog and
  FutureSignalDetailPanel to global toast store

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/ops/AIMonitoring.tsx

@@ -8,6 +8,7 @@ import {
   AIMonitoringEmptyState,
 } from '../../components/ai-monitoring'
 import { useAIOutputs, useUpdateAIOutputReviewStatus } from '../../hooks/useAIMonitoring'
+import { useToastStore } from '../../stores/toastStore'
 import type { AIOutput, AIOutputType } from '../../domain/aiOutput'
 import type { ReviewStatus } from '../../domain/enums'
 
@@ -58,6 +59,7 @@ export default function AIMonitoring() {
   const [filters, setFilters] = useState<Filters>({ type: '', reviewStatus: '', hasError: null })
   const [selectedOutput, setSelectedOutput] = useState<AIOutput | null>(null)
 
+  const showToast = useToastStore((s) => s.showToast)
   const { data: allOutputs = [], isLoading } = useAIOutputs()
   const updateStatus = useUpdateAIOutputReviewStatus()
 
@@ -66,11 +68,25 @@ export default function AIMonitoring() {
   const failedCount = allOutputs.filter(o => !!o.error).length
   const pendingCount = allOutputs.filter(o => o.reviewStatus === 'UNREVIEWED' || o.reviewStatus === 'FLAGGED').length
 
+  const STATUS_TOAST: Record<ReviewStatus, string> = {
+    UNREVIEWED: 'Status zurückgesetzt.',
+    IN_REVIEW: 'Output zur Prüfung markiert.',
+    APPROVED: 'Output genehmigt.',
+    REJECTED: 'Output abgelehnt.',
+    FLAGGED: 'Output markiert.',
+  }
+
   const handleUpdateStatus = (status: ReviewStatus) => {
     if (!selectedOutput) return
     updateStatus.mutate(
       { id: selectedOutput.id, status },
-      { onSuccess: (res) => setSelectedOutput(res.data) }
+      {
+        onSuccess: (res) => {
+          setSelectedOutput(res.data)
+          showToast(STATUS_TOAST[status] ?? 'Status aktualisiert.')
+        },
+        onError: () => showToast('Statusänderung fehlgeschlagen.', 'error'),
+      }
     )
   }
 

src/pages/ops/ReviewQueue.tsx

@@ -9,6 +9,7 @@ import {
 } from '../../components/review'
 import { useReviewQueue, useUpdateReviewStatus, useAddReviewNote } from '../../hooks/useReviewQueue'
 import { useSessionStore } from '../../stores/sessionStore'
+import { useToastStore } from '../../stores/toastStore'
 import type { ReviewTask, ReviewTaskStatus } from '../../domain/review'
 import type { ReviewFilters } from '../../provider/IReviewProvider'
 
@@ -24,6 +25,7 @@ function filterTasks(tasks: ReviewTask[], filters: ReviewFilters): ReviewTask[]
 
 export default function ReviewQueue() {
   const { currentUser } = useSessionStore()
+  const showToast = useToastStore((s) => s.showToast)
   const userRole = currentUser?.role ?? 'REVIEWER'
 
   const [filters, setFilters] = useState<ReviewFilters>({})
@@ -40,6 +42,15 @@ export default function ReviewQueue() {
   const escalatedCount = allTasks.filter(t => t.status === 'ESCALATED').length
   const criticalCount = allTasks.filter(t => t.priority === 'CRITICAL' && (t.status === 'PENDING' || t.status === 'IN_REVIEW')).length
 
+  const STATUS_TOAST: Record<ReviewTaskStatus, string> = {
+    PENDING: 'Status auf "Ausstehend" gesetzt.',
+    IN_REVIEW: 'Aufgabe zur Prüfung übernommen.',
+    APPROVED: 'Aufgabe genehmigt.',
+    REJECTED: 'Aufgabe abgelehnt.',
+    ESCALATED: 'Aufgabe eskaliert.',
+    NEEDS_MORE_DATA: 'Weitere Daten angefordert.',
+  }
+
   const handleAction = (status: ReviewTaskStatus) => {
     if (!selectedTask) return
     updateStatus.mutate(
@@ -47,7 +58,9 @@ export default function ReviewQueue() {
       {
         onSuccess: (res) => {
           setSelectedTask(res.data)
+          showToast(STATUS_TOAST[status] ?? 'Status aktualisiert.')
         },
+        onError: () => showToast('Statusänderung fehlgeschlagen.', 'error'),
       }
     )
   }
@@ -59,7 +72,9 @@ export default function ReviewQueue() {
       {
         onSuccess: (res) => {
           setSelectedTask(res.data)
+          showToast('Notiz hinzugefügt.')
         },
+        onError: () => showToast('Notiz konnte nicht gespeichert werden.', 'error'),
       }
     )
   }