feeiyu a514ad96fc Align agent sidebar headers with title bar (#62079)
# Objective

Fix the Agent sidebar header being two pixels lower than the title bar
on Linux.

This only affects Linux with client-side decorations: the main title bar
uses a negative one-pixel margin to overlap the client-drawn window
border, while the sidebar previously used a positive one-pixel margin on
every platform.

Fixes #53739

## Solution

Match the sidebar header spacing to the window decoration mode:

- Use `-1px` top margin for client-side decorations.
- Preserve the existing spacing for server-side decorations.
- Apply the fix to both the thread list and archive headers.

## Testing

- Manually tested on Linux. This only affects Linux because its
client-side window decorations require the adjusted title bar offset.

## 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)](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)](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

After this change:

[2026-08-02
18-20-19.webm](https://github.com/user-attachments/assets/1ef13ff2-2036-442b-8bcc-74ebeb8436c7)


---

Release Notes:

- Fixed misaligned Agent sidebar headers on Linux.
2026-08-03 14:47:45 +00:00
2026-07-29 13:03:22 +00:00
2026-01-22 23:57:26 +05:30
2026-07-27 05:59:53 +00:00
WIP
2023-12-14 09:25:14 -07:00
2026-04-29 10:27:47 +00:00
2025-02-04 09:02:59 -05:00
2025-10-27 13:27:59 -04:00
2026-06-27 15:06:29 +00:00
2025-10-17 18:58:14 +00:00
2026-03-17 16:34:35 +00:00
2026-04-29 10:27:47 +00:00

Zed

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