style(speaking): comment out ready-title and ready-subtitle

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

src/views/Editor/EnglishSpeaking/preview/TopicDiscussionPreview.vue

@@ -4,11 +4,8 @@
     <!-- Ready 阶段：极简首页（参照 enspeak 布局） -->
     <div v-if="dialogueState === 'checking-history'" class="ready-stage">
       <div class="ready-header">
-        <h1 class="ready-title">
-          <!-- <span class="ready-title-icon">💬</span> -->
-          Topic Discussion
-        </h1>
-        <p class="ready-subtitle">正在读取你的练习记录...</p>
+        <!-- <h1 class="ready-title">Topic Discussion</h1> -->
+        <!-- <p class="ready-subtitle">正在读取你的练习记录...</p> -->
       </div>
       <div class="ready-body">
         <span class="start-btn-spinner" />
@@ -17,11 +14,8 @@
 
     <div v-else-if="dialogueState === 'ready'" class="ready-stage">
       <div class="ready-header">
-        <h1 class="ready-title">
-          <!-- <span class="ready-title-icon">💬</span> -->
-          Topic Discussion
-        </h1>
-        <p class="ready-subtitle">话题讨论 · 与 AI 伙伴练习英语对话</p>
+        <!-- <h1 class="ready-title">Topic Discussion</h1> -->
+        <!-- <p class="ready-subtitle">话题讨论 · 与 AI 伙伴练习英语对话</p> -->
       </div>
 
       <div class="ready-body">
@@ -528,6 +522,9 @@ async function loadConfigFromBackend(id: string) {
     const { config } = await getSpeakingConfig(id)
     if (!isHistoryTokenCurrent(token)) return
     speakingStore.$patch({ config })
+    // $patch 深合并会把后端 config 里的空 systemPrompt/greeting 槽冲掉之前
+    // hydrate 进来的默认值，这里补回一次（只填空槽，保留老师已编辑的值）。
+    speakingStore.applyDialogueDefaults()
   } catch (err) {
     if (!isHistoryTokenCurrent(token)) return
     console.error('[speaking] load config failed:', err)