improvement(wrapped): 增加返回聊天页按钮

- Wrapped 页左上角新增返回按钮，快速回到 /chat

frontend/pages/wrapped/index.vue

@@ -13,6 +13,27 @@
     <!-- 左上角：刷新 + 复古模式开关 -->
     <div class="absolute top-6 left-6 z-20 select-none">
       <div class="flex items-center gap-3">
+        <button
+          type="button"
+          class="pointer-events-auto inline-flex items-center justify-center w-9 h-9 rounded-full bg-transparent text-[#07C160] hover:bg-[#07C160]/10 focus:outline-none focus-visible:ring-2 focus-visible:ring-[#07C160]/30 transition"
+          aria-label="返回上一级"
+          title="返回上一级"
+          @click="goBack"
+        >
+          <svg
+            class="w-4 h-4"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+            aria-hidden="true"
+          >
+            <path d="M10 19l-7-7m0 0l7-7m-7 7h18" />
+          </svg>
+        </button>
+
         <button
           type="button"
           class="pointer-events-auto inline-flex items-center justify-center w-9 h-9 rounded-full bg-transparent text-[#07C160] hover:bg-[#07C160]/10 focus:outline-none focus-visible:ring-2 focus-visible:ring-[#07C160]/30 disabled:opacity-60 disabled:cursor-not-allowed transition"
@@ -291,6 +312,10 @@ const goTo = (i) => {
   activeIndex.value = clampIndex(i)
 }
 
+const goBack = async () => {
+  await router.push('/chat')
+}
+
 const next = () => goTo(activeIndex.value + 1)
 const prev = () => goTo(activeIndex.value - 1)