Codex Provider Switcher v1.2.0

What is new

• Added a persistent CHN / ENG language selector to the native Windows GUI.
• Localized labels, status messages, dialogs, provider tests, host diagnostics,
  and validation errors in both Chinese and English.
• Improved the header and provider-action layout at the supported minimum
  window size.
• Exposed the selected language through the Windows UI Automation Toggle
  pattern and associated form fields with their visible labels.

Verified

• All provider, history, SSE, tool-calling, image, host, credential, and
  localization self-tests pass.
• Chinese and English layouts were visually checked at the default size and
  at the 680 x 520 minimum size.
• Mouse, keyboard, and UI Automation language switching persist through
  settings.json and restore on the next launch.

Boundaries

• Provider switching, Credential Manager key storage, and the stable chat
  history partition are unchanged.
• Plugin OAuth and mobile Remote pairing still depend on the official Codex
  and ChatGPT apps and have the same boundaries documented in v1.1.0.
• The release is unsigned and requires the .NET 8 Windows Desktop Runtime.