SMS Autofill doesn't work

[mflider]

Describe the bug
When using SMS 2FA to authenticate an account, the window to enter the 6-digit code has 6 distinct text boxes, which breaks the autofill built into macOS when using 2FA codes.

To Reproduce

1. Authenticate with SMS text message
2. Receive a code
3. In text box to enter the code, see an auto-suggestion from macOS to fill code
4. Click the auto-suggestion
5. The first digit is entered, but not the other 5, and the autofill form dismisses, and the text message is automatically deleted.
6. Have to get a NEW code, then type it in one number at a time.

Expected behavior
If there were a SINGLE text box, instead of 6 individual ones, users could fill in the autofill SMS code with a single click.

Screenshots

Version

• OS: macOS 26.2
• Xcodes: 3.0.2 (34)

[zhangqifan]

I previously opened PR #778 to improve paste support for the existing PIN code input fields (so that pasting a 6‑digit code like "123456" correctly fills all cells instead of only showing the last digit).

That PR focuses on making the current 6‑cell design behave correctly when pasting codes, whereas this issue is about switching to a single text field to enable native SMS autofill.

Just adding this here for context in case it’s helpful when deciding on the preferred direction for the PIN/SMS/2FA input.

[triplef]

Would be great to see auto-fill fixed. In addition to this not working, autofill also deletes the text message, so that if you click auto-fill the only way to proceed is to cancel and start over.