feat(i18n): add unnamed translation and use in session creation

Add "unnamed" translation in both zh-cn and en-us locales
Use the translation as default name when creating new sessions

src/renderer/src/i18n/locales/en-us.json

@@ -1035,6 +1035,7 @@
     "success": "Success",
     "swap": "Swap",
     "topics": "Topics",
+    "unnamed": "Unnamed",
     "update_success": "Update successfully",
     "upload_files": "Upload file",
     "warning": "Warning",

src/renderer/src/i18n/locales/zh-cn.json

@@ -1035,6 +1035,7 @@
     "success": "成功",
     "swap": "交换",
     "topics": "话题",
+    "unnamed": "未命名",
     "update_success": "更新成功",
     "upload_files": "上传文件",
     "warning": "警告",

src/renderer/src/pages/home/Tabs/components/Sessions.tsx

@@ -45,13 +45,14 @@ const Sessions: React.FC<SessionsProps> = ({ agentId }) => {
     if (!agent) return
     const session = {
       ...agent,
-      id: undefined
+      id: undefined,
+      name: t('common.unnamed')
     } satisfies CreateSessionForm
     const created = await createSession(session)
     if (created) {
       dispatch(setActiveSessionIdAction({ agentId, sessionId: created.id }))
     }
-  }, [agent, agentId, createSession, dispatch])
+  }, [agent, agentId, createSession, dispatch, t])
 
   const handleDeleteSession = useCallback(
     async (id: string) => {