feat(workflow): 5-Stage Lifecycle UI im Compliance Workflow-Editor

Erweitert Phase 1 (Backend 5-Stage Lifecycle, Migration 148) jetzt auch
im Frontend: Status-Pills, Buttons und Modal-Texte differenzieren nun
zwischen DSB- und Mandanten-Pruefung.

- WorkflowStatusBar zeigt 5 Schritte: draft -> review_internal ->
  review_client -> approved -> published, mit status-spezifischen
  Action-Buttons (Save/Submit, DSB-Freigabe, Mandant-Freigabe, Publish).
- ApprovalModal differenziert Mode 'approve-internal' / 'approve-client' /
  'reject' mit eigenen Titles und Button-Labels.
- useWorkflowActions ruft neue Endpoints /approve-internal und
  /approve-client (Backend Phase 1); approveVersion bleibt als
  Backward-Compat-Alias.
- page.tsx leitet Modal-Confirm an passende Action weiter und akzeptiert
  review_internal/review_client im draftVersion-Filter.
- _types.ts: Status-Union + STATUS_LABELS um beide Review-Stufen
  erweitert; alter 'review'-Wert bleibt fuer Bestandsdaten erhalten.
- CompareView, SplitViewEditor, HistoryPanel: Status-Rendering und neue
  Action-Labels (submitted_internal, approved_internal, approved_client).

LOC-Exception fuer admin-compliance/lib/sdk/types/sdk-steps.ts (525):
zentrale SDK-Step-Registry mit kanonischer Reihenfolge — splits wuerden
die globale seq-Garantie zerreissen.

[guardrail-change]

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/workflow/_hooks/useWorkflowActions.ts

@@ -2,6 +2,7 @@
 
 import { useState } from 'react'
 import { Document, Version, ApprovalHistoryItem } from '../_types'
+import type { ApprovalModalMode } from '../_components/ApprovalModal'
 
 interface UseWorkflowActionsParams {
   selectedDocument: Document | null
@@ -27,7 +28,7 @@ export function useWorkflowActions(params: UseWorkflowActionsParams) {
 
   const [saving, setSaving] = useState(false)
   const [approvalComment, setApprovalComment] = useState('')
-  const [showApprovalModal, setShowApprovalModal] = useState<'approve' | 'reject' | null>(null)
+  const [showApprovalModal, setShowApprovalModal] = useState<ApprovalModalMode | null>(null)
   const [approvalHistory, setApprovalHistory] = useState<ApprovalHistoryItem[]>([])
   const [showNewDocModal, setShowNewDocModal] = useState(false)
   const [newDocForm, setNewDocForm] = useState({ type: 'privacy_policy', name: '', description: '' })
@@ -123,10 +124,15 @@ export function useWorkflowActions(params: UseWorkflowActionsParams) {
   }
 
   const approveVersion = async () => {
+    // Backward-compat alias — leitet auf approve-internal (DSB → Mandant)
+    return approveInternal()
+  }
+
+  const approveInternal = async () => {
     if (!draftVersion) return
     setSaving(true)
     try {
-      const res = await fetch(`/api/admin/consent/versions/${draftVersion.id}/approve`, {
+      const res = await fetch(`/api/admin/consent/versions/${draftVersion.id}/approve-internal`, {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({ comment: approvalComment }),
@@ -138,10 +144,35 @@ export function useWorkflowActions(params: UseWorkflowActionsParams) {
         await loadVersions(selectedDocument!.id)
       } else {
         const err = await res.json()
-        setError(err.error || 'Fehler bei der Freigabe')
+        setError(err.error || 'Fehler bei der DSB-Freigabe')
       }
     } catch {
-      setError('Fehler bei der Freigabe')
+      setError('Fehler bei der DSB-Freigabe')
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  const approveClient = async () => {
+    if (!draftVersion) return
+    setSaving(true)
+    try {
+      const res = await fetch(`/api/admin/consent/versions/${draftVersion.id}/approve-client`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ comment: approvalComment }),
+      })
+
+      if (res.ok) {
+        setShowApprovalModal(null)
+        setApprovalComment('')
+        await loadVersions(selectedDocument!.id)
+      } else {
+        const err = await res.json()
+        setError(err.error || 'Fehler bei der Mandanten-Freigabe')
+      }
+    } catch {
+      setError('Fehler bei der Mandanten-Freigabe')
     } finally {
       setSaving(false)
     }
@@ -242,7 +273,8 @@ export function useWorkflowActions(params: UseWorkflowActionsParams) {
     newDocForm, setNewDocForm,
     creatingDoc,
     createNewDraft, saveDraft, submitForReview,
-    approveVersion, rejectVersion, publishVersion,
+    approveVersion, approveInternal, approveClient,
+    rejectVersion, publishVersion,
     createDocument, loadApprovalHistory,
   }
 }