When entering a login on the account sign-in page, spaces are automatically added after the dot.

### Steps to reproduce

1. Account login page.
2. Login field
3. Entering a point

### Outcome

I expected there to be no space after the period.

The space was added automatically.

### Your phone model

_No response_

### Operating system version

_No response_

### Application version and app store

_No response_

### Homeserver

_No response_

### Will you send logs?

Yes

### Are you willing to provide a PR?

Yes

Start by reproducing the issue on the account sign-in page, focusing on the login field's handling of a period. Trace that input behavior to its implementation and verify that entering a period no longer inserts a following space.

Written by the indexing model from the issue text.