重新构建dev产物（消息首页会话预览修复）

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

umd/index.dev.js

@@ -17951,6 +17951,7 @@ class TinodeWeb extends (react__WEBPACK_IMPORTED_MODULE_0___default().Component)
   constructor(props) {
     super(props);
     this.selfRef = react__WEBPACK_IMPORTED_MODULE_0___default().createRef();
+    this.previewPrefetchAttempted = new Set();
     this.state = this.getBlankState();
     this.handleResize = this.handleResize.bind(this);
     this.handleHashRoute = this.handleHashRoute.bind(this);
@@ -18801,6 +18802,7 @@ class TinodeWeb extends (react__WEBPACK_IMPORTED_MODULE_0___default().Component)
         newState.topicSelectedAcs = c.acs;
       }
     });
+    this.prefetchLatestMessagePreviews(newState.chatList);
     const past = new Date(0);
     newState.chatList.sort((a, b) => {
       const pins = me.pinnedTopicRank(b.topic) - me.pinnedTopicRank(a.topic);
@@ -18809,6 +18811,20 @@ class TinodeWeb extends (react__WEBPACK_IMPORTED_MODULE_0___default().Component)
     newState.searchableContacts = TinodeWeb.prepareSearchableContacts(newState.chatList, this.state.searchResults);
     this.setState(newState);
   }
+  prefetchLatestMessagePreviews(chatList) {
+    if (!this.tinode.isConnected()) {
+      return;
+    }
+    for (const c of chatList) {
+      if (!c.topic || c.seq <= 0 || c.latestMessage() || this.previewPrefetchAttempted.has(c.topic)) {
+        continue;
+      }
+      this.previewPrefetchAttempted.add(c.topic);
+      c.subscribe(c.startMetaQuery().withLaterData(1).build()).catch(err => {
+        console.warn(`Failed to prefetch latest message for '${c.topic}'`, err);
+      });
+    }
+  }
   static checkIfPinsUpdated(me, chatList) {
     for (let i = 0; i < chatList.length; i++) {
       const c = chatList[i];