lists items being moved up when using "completion" options

### Expected

When I'm writing a list, and select a word in the "completion" portion of the keyboard, it should keep the list "as is".

### Observed

When I'm writing in a list, and I select a word in the "completion" portion of the keyboard, it acts as though I deleted the "line-break".

Let's say I have a list :

LIST
- item 1
- item 2
- item 3

Now, I want to add the word "dummy" to item 2 by selecting it in the "completion" portion of the keyboard, I get :

LIST
- item 1
- item 2 dummy- item 3

### Reproduced

1. Create a list
2. write text at the end of the list
3. select a word in the "word completion" section of the keyboard

note that the bug is inconsistent and seemingly random.

Device Make : Samsung
Device Model : S21 Ultra
Device UI Version : 6.0
Android version : 14
Simplenote Version : 2.30

Start by reproducing the list-editing issue on the reported Samsung S21 Ultra with Android 14 and Simplenote 2.30, then trace how keyboard word completion is handled while editing list items. Done means selecting a completion word consistently preserves the list line break instead of joining the next item.

Written by the indexing model from the issue text.