Harden WebCRT reconnect, resource use, and SFTP UX.

Reuse detached sessions on reconnect, mount only the active tab, surface backpressure drops, gate SFTP for unsupported targets, and polish attach replay, find/recording performance, and terminal i18n.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/i18n/zh.ts

@@ -1037,9 +1037,26 @@ const zh = {
     postLoginPrompt: "登录后自动执行（每行一条，仅本设备）",
     postLoginSaved: "登录后命令已保存",
     sftp: {
+      title: "SFTP",
       refresh: "刷新",
+      up: "上级",
       upload: "上传",
       uploaded: "上传成功",
+      dir: "目录",
+    },
+    term: {
+      findPh: "查找…",
+      findPrev: "上一个",
+      findNext: "下一个",
+      findClose: "关闭查找",
+      copy: "复制",
+      paste: "粘贴",
+      clear: "清空",
+      pasting: "粘贴中 {{done}}/{{total}} 行…",
+      wsError: "[WebSocket 错误]",
+      wsClosed: "[WebSocket 已关闭 code={{code}}]",
+      sessionStatus: "[会话 {{state}}{{detail}}]",
+      outputTruncated: "[输出过快，已丢弃 {{count}} 段]",
     },
     err: {
       deviceType: "不支持的设备类型",
@@ -1052,6 +1069,9 @@ const zh = {
       connectFailed: "登录设备失败：{{detail}}",
       sftpHop: "SFTP 暂不支持跳板设备，请使用直连 SSH",
       sftpSsh: "SFTP 仅支持 SSH 协议",
+      sftpNeedPassword: "SFTP 需要已保存的 SSH 密码（会话弹窗密码不会用于文件传输）",
+      queueDropped: "终端输出过快，已丢弃约 {{count}} 段，内容可能不完整",
+      websocket: "WebSocket 连接失败",
     },
   },
   topology: {