feat(speaking): always-expand class report, drop collapse toggle

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/views/Student/components/SpeakingClassPanel/AISummary.vue

@@ -13,16 +13,10 @@
       </button>
     </div>
 
-    <!-- 折叠态常驻行 -->
+    <!-- 完成人数/比例常驻行 -->
     <div class="ai-completion">{{ completionLine }}</div>
 
-    <!-- 展开/收起 -->
-    <button class="ai-toggle" @click="expanded = !expanded">
-      {{ expanded ? lang.ssSpkCollapseReport : lang.ssSpkViewFullReport }}
-      <span class="ai-caret" :class="{ open: expanded }">▾</span>
-    </button>
-
-    <div v-if="expanded" class="ai-report-region">
+    <div class="ai-report-region">
       <div v-if="error" class="ai-report-error">
         <span>{{ lang.ssSpkReportFailed }}</span>
         <button @click="$emit('refresh')">{{ lang.ssSpkRetry }}</button>
@@ -50,8 +44,6 @@ const props = defineProps<{
 }>()
 defineEmits<{ refresh: [] }>()
 
-const expanded = ref(false)
-
 const renderedHtml = computed(() => renderReportMarkdown(props.markdown))
 
 // 「刚刚生成」/「N 秒前生成」/「N 分钟前生成」 — 每秒重算
@@ -122,23 +114,6 @@ const generatedAtLabel = computed(() => {
   margin-bottom: 8px;
 }
 
-.ai-toggle {
-  display: flex;
-  align-items: center;
-  gap: 4px;
-  font-size: 12px;
-  font-weight: 500;
-  color: #2563eb;
-  background: transparent;
-  border: none;
-  cursor: pointer;
-  padding: 0;
-}
-.ai-caret {
-  transition: transform .15s;
-  &.open { transform: rotate(180deg); }
-}
-
 .ai-report-region {
   margin-top: 12px;
   max-height: 360px;