## What changed

The Chat header keeps its chat icon and name on the left. Hovering or focusing anywhere in that header reveals **Close sidebar** on the right, where the control is easier to find. On touch screens the close control stays visible.

When Chat is closed, a small chat button remains just before the Document and Decisions tabs. It changes to the sidebar icon on hover or focus, and reopens Chat without discarding a draft.

## Why

The previous close control replaced the Chat icon on the opposite side of the header. The new placement gives people a consistent place to close and reopen the pane while keeping the document tabs available.

## Visual check

Actual browser UI from the integration fixture, with the open header hovered and the sidebar then closed:



## Verification

- 55 focused unit tests and 7 focused Chromium integration tests passed, including draft and focus behavior. - TypeScript checks, build, formatting, lint, and token checks passed. - A separate agent reviewed the implementation and found no actionable issue.