What happened?

In the Review tab, the Git changes area has several UI issues that make the review surface confusing for non-technical users.

Steps to reproduce

1. Open PawWork.
2. Open a session with Git changes.
3. Switch to the Review tab.
4. Look at the Git changes header area.

What did you expect to happen?

The Review tab should show only controls and labels that are meaningful in the current review workflow.

Required changes:

1. Remove the standalone + button at the top right of the Review Git changes area unless a clear workflow requires it.
2. Localize the Git changes heading into Chinese, because this label is user-facing and non-technical Chinese users will not understand it.
3. Remove support for switching between 统一 and 拆分. PawWork should use one unified diff display mode only, so the Review tab should not expose a unified/split toggle.

PawWork version

v0.2.4

OS version

macOS, exact version not captured in the internal report.

Can you reproduce it again?

Yes, every time

Screenshots, recordings, or extra context

Internal screenshot shows the Review tab active, the Git changes list visible, a standalone + button floating at the top right of the review content, the Git changes heading still in English, and a 统一 / 拆分 segmented control that no longer matches the intended product behavior. Note: open issue #77 has older UI polish text that suggested keeping a Review + visible. This issue reflects the newer product decision that this + should be removed unless a clear workflow requires it, the Git changes label should be Chinese, and diff viewing should stay in a single unified mode.