Add `;` key binding for Helix mode (#34315)

Closes #34111

In Helix mode, the `;` key should collapse the current selection without
moving the cursor. I've added a new action `vim::HelixCollapseSelection`
to support this behavior.


https://github.com/user-attachments/assets/1a40821a-f56f-456e-9d37-532500bef17b

Release Notes:

- Added `;` key binding to collapse the current text selection in Helix
mode
c1307cead4Daniel Sauble committed on 7/18/2025, 4:30:01 AM· committed by GitHubparent8a7bd5f
2 files changedLine totals unavailable