feat: 同学作品和批改都能看全部班级，批改默认大图预览

- 学生“同学作品”加“本班 / 全部班级”切换（peers?scope=all），作品标班级，仍是交过才开放、打分前匿名；
  服务端放开：交过某题后能看任何班同学在这道题上的提交
- 批改页班级下拉加“全部班级”：一道题全校作品按班级分组，没人交的班收起成一行；
  /review/class、/review/progress 不传 classname 就是全部班级
- 点开作品默认大图：作品墙收起，预览占满中间，打分 / 课上展示 / 提示词放右栏；
  Esc 返回作品墙，可切回小面板（记住选择）；成绩册弹出的详情也用大图布局

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/review/PeersDrawer.vue

@@ -10,9 +10,15 @@
           style="margin-top: 40px"
         />
         <template v-else-if="data">
-          <p class="hint">
-            本班同学在这道题上最新的作品。打分之前不显示是谁做的，打完分才显示。
-          </p>
+          <n-flex justify="space-between" align="center" class="bar">
+            <span class="hint">
+              同学们在这道题上最新的作品。打分之前不显示是谁做的，打完分才显示。
+            </span>
+            <n-radio-group v-model:value="scope" size="small">
+              <n-radio-button value="class">本班</n-radio-button>
+              <n-radio-button value="all">全部班级</n-radio-button>
+            </n-radio-group>
+          </n-flex>
           <n-empty v-if="!data.items.length" description="还没有同学交这道题" />
           <div class="grid">
             <div v-for="w in data.items" :key="w.id" class="work">
@@ -25,7 +31,10 @@
                 ></iframe>
               </button>
               <div class="info">
-                <span :class="{ anon: !w.username }">{{ w.username ?? "匿名同学" }}</span>
+                <span :class="{ anon: !w.username }">
+                  <span v-if="scope === 'all' && w.classname" class="cls">{{ w.classname }} 班</span>
+                  {{ w.username ?? "匿名同学" }}
+                </span>
                 <span v-if="w.my_score" class="mine">我给了 {{ w.my_score }} 分</span>
               </div>
               <div v-if="!w.my_score" class="rates">
@@ -79,19 +88,26 @@ const data = ref<PeerWorks | null>(null)
 const loading = ref(false)
 const rating = ref<string | null>(null)
 const large = ref<PeerWork | null>(null)
+const scope = ref<"class" | "all">("class")
 
 const docOf = (w: PeerWork) =>
   buildPreviewDocument({ html: w.html, css: w.css, js: w.js, assetBaseUrl: props.assetBaseUrl })
 
-watch(show, async (open) => {
-  if (!open || !props.taskId) return
+let seq = 0
+async function load() {
+  if (!props.taskId) return
+  const s = ++seq
   loading.value = true
   try {
-    data.value = await Review.peers(props.taskId)
+    const res = await Review.peers(props.taskId, scope.value)
+    if (s === seq) data.value = res
   } finally {
-    loading.value = false
+    if (s === seq) loading.value = false
   }
-})
+}
+
+watch(show, (open) => open && load())
+watch(scope, load)
 
 async function rate(w: PeerWork, score: number) {
   rating.value = w.id
@@ -107,12 +123,22 @@ async function rate(w: PeerWork, score: number) {
 }
 </script>
 <style scoped>
+.bar {
+  margin-bottom: 12px;
+  flex-wrap: nowrap !important;
+}
+
 .hint {
-  margin: 0 0 12px;
   font-size: 13px;
   color: var(--wp-muted);
 }
 
+.cls {
+  margin-right: 4px;
+  color: var(--wp-muted);
+  font-size: 12px;
+}
+
 .grid {
   display: grid;
   grid-template-columns: repeat(2, minmax(0, 1fr));

client/src/components/review/ReviewPanel.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="panel">
+  <div :class="['panel', { wide }]">
     <div class="head">
       <div class="who">
         <b>{{ sub?.username ?? "…" }}</b>
@@ -24,14 +24,31 @@
             下一个学生（J）
           </n-tooltip>
         </template>
-        <n-button size="small" quaternary @click="emit('close')">
-          <Icon icon="lucide:x" />
+        <n-button
+          v-if="canWiden"
+          size="small"
+          quaternary
+          @click="emit('toggle-wide')"
+        >
+          <template #icon>
+            <Icon :icon="wide ? 'lucide:minimize-2' : 'lucide:maximize-2'" />
+          </template>
+          {{ wide ? "小面板" : "大图" }}
         </n-button>
+        <n-tooltip>
+          <template #trigger>
+            <n-button size="small" quaternary @click="emit('close')">
+              <Icon icon="lucide:x" />
+            </n-button>
+          </template>
+          {{ wide ? "返回作品墙（Esc）" : "关闭" }}
+        </n-tooltip>
       </n-flex>
     </div>
 
     <n-spin :show="loading" class="body">
-      <template v-if="sub">
+      <div v-if="sub" class="layout">
+       <div class="stage">
         <div class="versions" v-if="versions.length > 1">
           <span class="muted">共交了 {{ versions.length }} 次：</span>
           <button
@@ -53,6 +70,8 @@
           </span>
           <n-button text size="small" @click="openFull">全屏打开</n-button>
         </n-flex>
+       </div>
+       <div class="side">
 
         <section>
           <h4>打分</h4>
@@ -106,7 +125,8 @@
             </li>
           </ol>
         </section>
-      </template>
+       </div>
+      </div>
     </n-spin>
   </div>
 </template>
@@ -128,6 +148,10 @@ import type {
 // 老师看一份提交：预览、交过的各个版本、打分、课上展示、加入作品展、提示词链
 const props = defineProps<{
   submissionId: string
+  // 大图：预览占满左边，打分和提示词放右边一栏
+  wide?: boolean
+  // 是否显示“大图 / 小面板”切换
+  canWiden?: boolean
   // 作品墙里用：能不能切到上一个 / 下一个学生
   nav?: { prev: boolean; next: boolean }
 }>()
@@ -135,6 +159,7 @@ const emit = defineEmits<{
   prev: []
   next: []
   close: []
+  "toggle-wide": []
   // 让作品墙同步更新这张卡片
   changed: [patch: { id: string; my_score?: number; score?: number; flag?: FlagType }]
 }>()
@@ -282,6 +307,41 @@ onUnmounted(() => window.removeEventListener("keydown", onKey))
   padding: 12px 14px 20px;
 }
 
+/* 大图：左边预览占满高度，右边一栏单独滚动 */
+.wide .body {
+  overflow: hidden;
+  padding: 0;
+}
+
+.wide .body :deep(.n-spin-content) {
+  height: 100%;
+}
+
+.wide .layout {
+  height: 100%;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 320px;
+}
+
+.wide .stage {
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  padding: 12px 14px;
+}
+
+.wide .stage .frame {
+  flex: 1;
+  height: auto;
+  min-height: 0;
+}
+
+.wide .side {
+  border-left: 1px solid var(--wp-line);
+  overflow-y: auto;
+  padding: 0 14px 20px;
+}
+
 .muted {
   color: var(--wp-muted);
   font-size: 12px;
@@ -361,6 +421,11 @@ h4 {
 
 .hint {
   margin-left: 6px;
+  white-space: nowrap;
+}
+
+.wide .rates {
+  flex-wrap: wrap;
 }
 
 .chain {