[Bug]: Mobile: Enter after inserting transaction split amount > UI moves to next split but keyboard focus stays on the 1st amount

### Verified issue does not already exist?

- [X] I have searched and found no existing issue
- [X] I will be providing steps how to reproduce the bug (in most cases this will also mean uploading a demo budget file)

### What happened?

I was expecting that the focus would've moved to the next split items amount if the UI moved there. Or actually, that it would've closed the keyboard

Steps to repro:

1. be on mobile (view)
2. Click on new transaction > enter an amount
3. Click 'split' > type the amount > press enter
(4. move to the second split, enter amount, press enter > nothing happens)

Happens on edge and on v24.11.0, Chrome 131 on android and Windows 11

https://github.com/user-attachments/assets/afa4dc33-92f6-4ca8-a3f6-50aab3739711

### Where are you hosting Actual?

Pikapods

### What browsers are you seeing the problem on?

Chrome

### Operating System

Mobile Device