Improve WebCRT connect UX and terminal input handling.

Open shells asynchronously with clearer prompt settling, fix Telnet CRLF expansion, and add right-click paste with safer focus behavior.

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

web/src/i18n/en.ts

@@ -2388,6 +2388,8 @@ const en = {
       custom: "Custom",
     },
     copyOnSelect: "Copy on select",
+    rightClickPaste: "Paste on right click",
+    rightClickPasteHint: "Shift + right click opens the menu. Turn off to always show the menu.",
     pasteDelay: "Paste max line wait",
     pasteDelayOff: "No delay (bulk send)",
     keepalive: "SSH keepalive",

web/src/i18n/zh.ts

@@ -2370,6 +2370,8 @@ const zh = {
       custom: "自定义",
     },
     copyOnSelect: "选中即复制",
+    rightClickPaste: "右键直接粘贴",
+    rightClickPasteHint: "Shift + 右键打开菜单；关闭此项后，右键始终打开菜单。",
     pasteDelay: "粘贴最大行间隔",
     pasteDelayOff: "无延迟（整块发送）",
     keepalive: "SSH Keepalive",