feat(webui): support remote Codex OAuth login (#5174)

webui/src/i18n/locales/en/common.json

@@ -773,6 +773,7 @@
       "signedInAs": "Signed in as {{account}}",
       "signInHelp": "Sign in from this device; no API key is stored in config.",
       "remoteSignInHelp": "Select Sign in to open xAI on your computer, then paste the authorization code shown after login.",
+      "codexRemoteSignInHelp": "Sign in through this browser, then paste the full localhost callback URL back into nanobot.",
       "signInRequired": "Sign in required",
       "signInBeforeSaving": "Sign in before saving this provider in the preset.",
       "signedIn": "Signed in",
@@ -782,7 +783,14 @@
       "saveProxy": "Save proxy",
       "localCodeHelp": "Complete sign-in in your browser. Nanobot usually finishes automatically; if it does not, paste the authorization code below.",
       "remoteCodeHelp": "Select Sign in to open xAI on your computer. After signing in, paste the authorization code shown by xAI below.",
+      "localCallbackHelp": "Complete sign-in in your browser. Nanobot usually finishes automatically; if it does not, copy the full localhost callback URL from the address bar and paste it below.",
+      "remoteCallbackHelp": "Open ChatGPT in this browser and finish signing in. When the localhost page fails to load, copy the full URL from the address bar and paste it below.",
       "authorizationCode": "Authorization code",
+      "callbackUrl": "Full callback URL",
+      "callbackUrlPlaceholder": "http://localhost:1455/auth/callback?code=…&state=…",
+      "openChatGPT": "Open ChatGPT",
+      "pasteCallbackToContinue": "Paste the callback URL to continue.",
+      "waitingForCallback": "Waiting for the browser callback…",
       "finishSignIn": "Finish sign-in"
     },
     "skills": {