settings_ui: Improve control alignment for multiline settings rows (#49850)

Altay and Danilo Leal created

Closes #49848

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

## Summary
Align right-side controls in settings rows when descriptions wrap to
multiple lines, and relax the text-width cap for better balance.

## Changes
- Top-aligned settings row containers in shared settings UI render paths
by adding `items_start()` to:
  - Setting rows (`render_settings_item`)
  - Sub-page link rows
  - Action link rows
- Updated the left text column width constraint in
`render_settings_item` from `w_3_4` to `w_full + max_w_2_3 + min_w_0` to
avoid overlap while reducing excess empty space.

## Validation
- Built and ran Zed locally with `cargo run`.
- Manual verification in Settings pages with multiline descriptions and
right-side controls:
  - General
  - Appearance
  - Languages & Tools
  - Agent/Terminal-related sections
- Confirmed improved control alignment and no right-column text overlap
in the tested views.

  | Before | After |
  |---|---|
|
![1-before](https://github.com/user-attachments/assets/bf548d15-a1a6-4917-81ac-0a1afefa2ea1)
|
![1-after](https://github.com/user-attachments/assets/47a61610-7b74-48bd-838d-e39e3b578d19)
|
|
![2-before](https://github.com/user-attachments/assets/92c0bd32-9772-42f4-be98-b1818556fa80)
|
![2-after](https://github.com/user-attachments/assets/188e0fdf-91ea-49bf-9648-9177107d94c9)
|







## Linked Issues
- #49848

Release Notes:

- Fixed settings row layout so right-side controls align better with
multiline setting descriptions.

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

Change summary

crates/settings_ui/src/settings_ui.rs | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

Detailed changes