Support IME Input in the Expression Editor

Hello,

Please add proper IME (input method editor) support to the Expression Editor so that users can enter Chinese, Japanese, Korean, and other non-Latin languages directly.

Currently, Japanese text cannot be entered directly in the Expression Editor. The only reliable workaround is to compose the text in another application (such as Notepad) and then copy and paste it into it.

Supporting IME input in the Expression Editor significantly reduces productivity for users working in languages that require IME.