feat: 拦截浏览器返回键，退出房间前弹窗确认

src/app/room/[id]/page.tsx

@@ -1,9 +1,10 @@
 "use client";
 
-import { useEffect, useState, useCallback } from "react";
+import { useEffect, useState, useCallback, useRef } from "react";
 import { useParams, useRouter } from "next/navigation";
 import TopNav from "@/components/TopNav";
 import SwipeDeck from "@/components/SwipeDeck";
+import LeaveConfirmModal from "@/components/LeaveConfirmModal";
 import { useRoomPolling } from "@/hooks/useRoomPolling";
 import { getUserId } from "@/lib/userId";
 
@@ -15,6 +16,8 @@ export default function RoomPage() {
   const [userId, setUserId] = useState("");
   const [joined, setJoined] = useState(false);
   const [joinFailed, setJoinFailed] = useState(false);
+  const [showLeaveConfirm, setShowLeaveConfirm] = useState(false);
+  const leavingRef = useRef(false);
 
   const {
     userCount, match, matchType, matchLikes, runnerUps, likeCounts, swipeCounts, restaurants, notFound, mutate,
@@ -34,6 +37,42 @@ export default function RoomPage() {
     }).catch(() => setJoinFailed(true));
   }, [roomId]);
 
+  useEffect(() => {
+    window.history.pushState({ roomGuard: true }, "");
+
+    const handlePopState = () => {
+      if (leavingRef.current) return;
+      window.history.pushState({ roomGuard: true }, "");
+      setShowLeaveConfirm(true);
+    };
+
+    const handleBeforeUnload = (e: BeforeUnloadEvent) => {
+      if (leavingRef.current) return;
+      e.preventDefault();
+    };
+
+    window.addEventListener("popstate", handlePopState);
+    window.addEventListener("beforeunload", handleBeforeUnload);
+    return () => {
+      window.removeEventListener("popstate", handlePopState);
+      window.removeEventListener("beforeunload", handleBeforeUnload);
+    };
+  }, []);
+
+  const confirmLeave = useCallback(() => {
+    leavingRef.current = true;
+    setShowLeaveConfirm(false);
+    router.push("/");
+  }, [router]);
+
+  const cancelLeave = useCallback(() => {
+    setShowLeaveConfirm(false);
+  }, []);
+
+  const handleExitRequest = useCallback(() => {
+    setShowLeaveConfirm(true);
+  }, []);
+
   const handleReset = useCallback(async () => {
     await fetch(`/api/room/${roomId}/reset`, { method: "POST" });
     await mutate();
@@ -78,7 +117,7 @@ export default function RoomPage() {
 
   return (
     <div className="flex h-dvh flex-col bg-background">
-      <TopNav roomId={roomId} userCount={userCount} />
+      <TopNav roomId={roomId} userCount={userCount} onExit={handleExitRequest} />
       <SwipeDeck
         restaurants={restaurants}
         roomId={roomId}
@@ -94,6 +133,11 @@ export default function RoomPage() {
         onReset={handleReset}
         onNarrow={handleNarrow}
       />
+      <LeaveConfirmModal
+        open={showLeaveConfirm}
+        onConfirm={confirmLeave}
+        onCancel={cancelLeave}
+      />
     </div>
   );
 }

src/components/LeaveConfirmModal.tsx

@@ -0,0 +1,75 @@
+"use client";
+
+import { useRef } from "react";
+import { motion, AnimatePresence } from "framer-motion";
+import { LogOut } from "lucide-react";
+
+interface LeaveConfirmModalProps {
+  open: boolean;
+  onConfirm: () => void;
+  onCancel: () => void;
+}
+
+export default function LeaveConfirmModal({
+  open,
+  onConfirm,
+  onCancel,
+}: LeaveConfirmModalProps) {
+  const backdropRef = useRef<HTMLDivElement>(null);
+
+  const handleBackdropClick = (e: React.MouseEvent) => {
+    if (e.target === backdropRef.current) onCancel();
+  };
+
+  return (
+    <AnimatePresence>
+      {open && (
+        <motion.div
+          ref={backdropRef}
+          className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 backdrop-blur-sm"
+          initial={{ opacity: 0 }}
+          animate={{ opacity: 1 }}
+          exit={{ opacity: 0 }}
+          transition={{ duration: 0.15 }}
+          onClick={handleBackdropClick}
+        >
+          <motion.div
+            className="mx-6 w-full max-w-xs rounded-2xl bg-white px-6 py-6 shadow-2xl"
+            initial={{ scale: 0.9, opacity: 0 }}
+            animate={{ scale: 1, opacity: 1 }}
+            exit={{ scale: 0.9, opacity: 0 }}
+            transition={{ type: "spring", damping: 25, stiffness: 350 }}
+          >
+            <div className="flex flex-col items-center">
+              <div className="flex h-12 w-12 items-center justify-center rounded-full bg-rose-50">
+                <LogOut size={22} className="text-rose-500" />
+              </div>
+
+              <h2 className="mt-4 text-base font-bold text-zinc-900">
+                确定要退出房间吗？
+              </h2>
+              <p className="mt-1.5 text-center text-xs leading-relaxed text-zinc-400">
+                退出后你的滑卡进度不会丢失，可以用房间号重新加入
+              </p>
+
+              <div className="mt-5 flex w-full gap-2.5">
+                <button
+                  onClick={onCancel}
+                  className="flex h-11 flex-1 items-center justify-center rounded-xl border border-zinc-200 bg-white text-sm font-semibold text-zinc-700 transition-colors active:bg-zinc-50"
+                >
+                  继续滑卡
+                </button>
+                <button
+                  onClick={onConfirm}
+                  className="flex h-11 flex-1 items-center justify-center rounded-xl bg-rose-500 text-sm font-semibold text-white shadow-md shadow-rose-200 transition-colors active:bg-rose-600"
+                >
+                  退出房间
+                </button>
+              </div>
+            </div>
+          </motion.div>
+        </motion.div>
+      )}
+    </AnimatePresence>
+  );
+}

src/components/TopNav.tsx

@@ -1,7 +1,6 @@
 "use client";
 
 import { useState, useCallback } from "react";
-import { useRouter } from "next/navigation";
 import { Users, QrCode, LogOut } from "lucide-react";
 import { motion, AnimatePresence } from "framer-motion";
 import QrInviteModal from "./QrInviteModal";
@@ -9,10 +8,10 @@ import QrInviteModal from "./QrInviteModal";
 interface TopNavProps {
   roomId: string;
   userCount: number;
+  onExit?: () => void;
 }
 
-export default function TopNav({ roomId, userCount }: TopNavProps) {
-  const router = useRouter();
+export default function TopNav({ roomId, userCount, onExit }: TopNavProps) {
   const [toast, setToast] = useState("");
   const [showQr, setShowQr] = useState(false);
 
@@ -50,7 +49,7 @@ export default function TopNav({ roomId, userCount }: TopNavProps) {
             <span className="font-semibold text-emerald-500">{userCount}</span>
           </div>
           <button
-            onClick={() => router.push("/")}
+            onClick={onExit}
             className="ml-1 flex items-center justify-center rounded-full p-1 text-zinc-400 transition-colors active:bg-zinc-100 active:text-zinc-600"
             aria-label="退出房间"
           >