🐛 fix: Unable to switch to default topic (#10472)

* 修复: 更新话题项编辑状态的条件判断逻辑

* 修复: 修改 Alt+Click 事件处理逻辑以保持当前话题选择

* 修复: 添加 Cerebras 模型提供者的代理 URL 占位符

src/app/[variants]/(main)/chat/components/topic/features/Topic/TopicListContent/TopicItem/index.tsx

@@ -53,7 +53,10 @@ export interface ConfigCellProps {
 const TopicItem = memo<ConfigCellProps>(({ title, active, id, fav, threadId }) => {
   const { styles, cx } = useStyles();
   const toggleConfig = useGlobalStore((s) => s.toggleMobileTopic);
-  const [toggleTopic, editing] = useChatStore((s) => [s.switchTopic, s.topicRenamingId === id]);
+  const [toggleTopic, editing] = useChatStore((s) => [
+    s.switchTopic,
+    s.topicRenamingId !== undefined && s.topicRenamingId === id,
+  ]);
   const activeId = useSessionStore((s) => s.activeId);
   const [isHover, setHovering] = useState(false);
 
@@ -65,6 +68,8 @@ const TopicItem = memo<ConfigCellProps>(({ title, active, id, fav, threadId }) =
         distribution={'space-between'}
         horizontal
         onClick={(e) => {
+          // Alt+Click should keep the current topic selection (reserved shortcut)
+          if (e.altKey) return;
           // 重命名时不切换话题
           if (editing) return;
           // Ctrl/Cmd+点击在新窗口打开

src/config/modelProviders/cerebras.ts

@@ -9,6 +9,9 @@ const Cerebras: ModelProviderCard = {
   modelsUrl: 'https://inference-docs.cerebras.ai/models/overview',
   name: 'Cerebras',
   settings: {
+    proxyUrl: {
+      placeholder: 'https://api.cerebras.ai/v1',
+    },
     sdkType: 'openai',
     showModelFetcher: true,
   },