fix(order): stabilize zustand selector snapshots

Move filter-based derivations out of Zustand selectors in order/chat/review detail pages so snapshots stay stable under useSyncExternalStore checks. Add evidence-backed comments referencing React useSyncExternalStore guidance and Zustand issues #1936/#3155 to document the regression trigger.

app/(order)/chat/[id]/page.tsx

@@ -3,7 +3,7 @@
 import { ArrowLeft, ImagePlus, Lock, Send } from "lucide-react"
 import Image from "next/image"
 import Link from "next/link"
-import { use, useRef, useState } from "react"
+import { use, useMemo, useRef, useState } from "react"
 import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar"
 import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
@@ -16,7 +16,15 @@ import { useChatStore } from "@/store/chat"
 export default function ChatDetailPage({ params }: { params: Promise<{ id: string }> }) {
   const { id } = use(params)
   const session = useChatStore((state) => state.sessions.find((item) => item.id === id))
-  const messages = useChatStore((state) => state.messages.filter((item) => item.sessionId === id))
+  const allMessages = useChatStore((state) => state.messages)
+  // Filter logic runs here via useMemo rather than inside the Zustand selector.
+  // useSyncExternalStore requires a stable snapshot reference on each render.
+  // Inline filter in a selector creates a new array per call and can trigger
+  // infinite re-render loops in Zustand v5 (pmndrs/zustand#1936).
+  const messages = useMemo(
+    () => allMessages.filter((item) => item.sessionId === id),
+    [allMessages, id],
+  )
   const sendTextMessage = useChatStore((state) => state.sendTextMessage)
   const sendImageMessage = useChatStore((state) => state.sendImageMessage)
   const [input, setInput] = useState("")

app/(order)/order/[id]/page.tsx

@@ -2,7 +2,7 @@
 
 import { ArrowLeft, CheckCircle, Clock, Star } from "lucide-react"
 import Link from "next/link"
-import { use, useEffect, useState } from "react"
+import { use, useEffect, useMemo, useState } from "react"
 import OrderActions from "@/components/order-actions"
 import { Badge } from "@/components/ui/badge"
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
@@ -37,7 +37,12 @@ export default function OrderDetailPage({ params }: { params: Promise<{ id: stri
   const order = useOrderStore((state) => state.orders.find((item) => item.id === id))
   const sessions = useChatStore((state) => state.sessions)
   const ensureOrderSession = useChatStore((state) => state.ensureOrderSession)
-  const reviews = useReviewStore((state) => state.reviews.filter((item) => item.orderId === id))
+  const allReviews = useReviewStore((state) => state.reviews)
+  // Filtering is deferred to useMemo after reading the raw store array.
+  // Zustand v5 compares selector outputs by reference stability.
+  // Returning a fresh filtered array from the selector can re-trigger updates
+  // and loop under useSyncExternalStore (pmndrs/zustand#1936, #3155).
+  const reviews = useMemo(() => allReviews.filter((item) => item.orderId === id), [allReviews, id])
   const [nowTs, setNowTs] = useState(Date.now())
 
   useEffect(() => {

app/(order)/review/[id]/page.tsx

@@ -2,7 +2,7 @@
 
 import { ArrowLeft, Lock, Star } from "lucide-react"
 import Link from "next/link"
-import { use, useState } from "react"
+import { use, useMemo, useState } from "react"
 import { Button } from "@/components/ui/button"
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
 import { Label } from "@/components/ui/label"
@@ -16,7 +16,12 @@ export default function ReviewPage({ params }: { params: Promise<{ id: string }>
   const order = useOrderStore((state) => state.orders.find((item) => item.id === id))
   const userId = useAuthStore((state) => state.user?.id)
   const submitReview = useReviewStore((state) => state.submitReview)
-  const reviews = useReviewStore((state) => state.reviews.filter((item) => item.orderId === id))
+  const allReviews = useReviewStore((state) => state.reviews)
+  // The selector returns the raw store array and useMemo derives the subset.
+  // This keeps useSyncExternalStore snapshots stable across render checks.
+  // Inline filter inside the selector creates a new array reference each call
+  // and can cause infinite re-render loops in Zustand v5 (pmndrs/zustand#3155).
+  const reviews = useMemo(() => allReviews.filter((item) => item.orderId === id), [allReviews, id])
   const [rating, setRating] = useState(0)
   const [hoverRating, setHoverRating] = useState(0)
   const [content, setContent] = useState("")