Closes #5133 and discussion https://github.com/zed-industries/zed/discussions/33493 This PR adds two new commands to select next/previous siblings in the syntax tree. These commands were modelled after the existing ones about expand/shrink selection. With this PR I've added new key bindings inspired by `helix` for previous / next / expand / shrink selections. https://github.com/user-attachments/assets/4ef7fadb-0b82-4897-95c7-1737827bf4ac Release Notes: - Add commands to select next/previous siblings in the syntax tree --------- Co-authored-by: Joseph T. Lyons <JosephTLyons@gmail.com>