feat(extension): make the local daemon port configurable in the popup

The extension was hardwired to 52800; persist a custom loopback port and reconnect when it changes so users can match a non-default daemon.

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

packages/i18n/src/locales/en-US/extension.json

@@ -26,6 +26,11 @@
     "controlHintsToggleTitle": "Control hints",
     "controlHintsToggleHint": "Show the status pill and orange glow while the Agent controls a page.",
     "controlHintsInfoLabel": "About control hints",
+    "daemonPortLabel": "Connection port",
+    "daemonPortHint": "This port is used to connect to the local daemon. Do not change it unless necessary.",
+    "daemonPortInfoLabel": "About connection port",
+    "daemonPortInvalid": "Enter a port between 1 and 65535.",
+    "daemonUnreachable": "Can't connect. Check the daemon is running and the port matches.",
     "versionSkewWarning": "Extension protocol v{{extensionProtocol}}, CLI protocol v{{cliProtocol}}. Protocol versions differ — please upgrade.",
     "upgradeAvailable": "Upgradable",
     "launcher": {

packages/i18n/src/locales/zh-CN/extension.json

@@ -26,6 +26,11 @@
     "controlHintsToggleTitle": "控制提示",
     "controlHintsToggleHint": "Agent 控制页面时显示提示条和橙色闪光。",
     "controlHintsInfoLabel": "控制提示说明",
+    "daemonPortLabel": "连接端口",
+    "daemonPortHint": "扩展通过此端口连接本机 daemon。非必要请勿修改。",
+    "daemonPortInfoLabel": "连接端口说明",
+    "daemonPortInvalid": "请输入 1 到 65535 之间的端口号。",
+    "daemonUnreachable": "无法连接，请确认 daemon 已启动且端口一致。",
     "versionSkewWarning": "扩展协议 v{{extensionProtocol}}，CLI 协议 v{{cliProtocol}}。协议版本不同，请及时升级。",
     "upgradeAvailable": "可升级",
     "launcher": {