fix: review link always visible for posts with approval token

Derived from post.approval_token instead of transient state, so it
persists when the panel is closed and reopened.

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

client/src/components/PostDetailPanel.jsx

@@ -23,7 +23,6 @@ export default function PostDetailPanel({ post, onClose, onSave, onDelete, brand
 
   // Review state
   const [submittingReview, setSubmittingReview] = useState(false)
-  const [reviewUrl, setReviewUrl] = useState('')
   const [copied, setCopied] = useState(false)
 
   // Attachments state
@@ -36,6 +35,7 @@ export default function PostDetailPanel({ post, onClose, onSave, onDelete, brand
 
   const postId = post?._id || post?.id
   const isCreateMode = !postId
+  const reviewUrl = post?.approval_token ? `${window.location.origin}/review-post/${post.approval_token}` : ''
 
   useEffect(() => {
     if (post) {
@@ -149,8 +149,7 @@ export default function PostDetailPanel({ post, onClose, onSave, onDelete, brand
     if (dirty) await handleSave()
     setSubmittingReview(true)
     try {
-      const res = await api.post(`/posts/${postId}/submit-review`)
-      setReviewUrl(res.reviewUrl || '')
+      await api.post(`/posts/${postId}/submit-review`)
       setForm(f => ({ ...f, status: 'in_review' }))
       toast.success(t('posts.submittedForReview'))
       onSave(postId, {}) // reload parent