Add support for Visual Line select in terminal vi mode (#63251)

# Objective

Add support for Visual Line Select in terminal vi mode.

## Solution

Add handling for "V" akin to Visual Line Select mode in vim.

## Testing

manually tested these changes by running locally (`cargo run`)

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

## Showcase


https://github.com/user-attachments/assets/a39636cd-a82e-444d-bdac-8f86d76f03f4



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Release Notes:

- Added support for Visual Line Select in terminal vi mode
c8dfe26a7ePranav Bansal committed on 8/27/2026, 6:40:50 AM· committed by GitHubparent6efd495
1 file changedLine totals unavailable