gpui: Add `grid_rows_min_content` and `grid_rows_max_content` methods (#61837)

# Objective

- GPUI provides `grid_cols_min_content()` and `grid_cols_max_content()`,
but the `grid_rows_*_content()` methods are missing.

## Solution

- This PR adds the `grid_rows_min_content()` and
`grid_rows_max_content()` methods, and renames the enum
`TemplateColumnMinSize` to `GridTemplateMinSize`.

## Testing

- I have tested locally.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [ ] 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


Release Notes:

- N/A
5ccbbbd88fBowen Xu committed on 7/29/2026, 10:24:22 AM· committed by GitHubparentc2db0f1
3 files changedLine totals unavailable