Allow moving Cursor in both directions with a single spacebar gesture

[thisisartman]

Samsung Keyboard allows you to move the cursor in both directions with one gesture. I tried to replicate the behaviour with HeliBoard but it requires a separate initiation of the gesture for each direction.

I am attaching a screen recording for reference. Keyboard 1 is HeliBoard and Keyboard 2 is Samsung Keyboard.

Screen_Recording_20260311_140403_Samsung.Notes.mp4

[Helium314]

I think this was in the initial PR implementing the up/down movement, and when testing I had a issues with unintentional up/down movements when there was only a single line of text.

Implementation of movement within the same gesture definitiely should take care of this.