Update the tool selection wizard so pressing Enter on a highlighted tool
automatically selects it before proceeding to the review step. This aligns
with common CLI expectations where Enter confirms the highlighted item.
Changes:
- Add logic to select the currently highlighted tool when Enter is pressed
- Update help text to clarify that Enter selects the highlighted tool
- Maintain Space key for toggling multiple selections
This reduces friction during onboarding by matching user expectations,
especially for users who navigate to a tool and press Enter without
first toggling it with Space.