Desktop: Code changes (workspace changes) UI not tested and needs beautification

[wangtsiao]

Task

The code changes/workspace changes feature has not been thoroughly tested on the Desktop app, and its UI design needs improvement.

Issues

1. Not tested on Desktop — The workspace changes display (showing file diffs, additions, modifications) has not been tested in the Desktop app
2. UI needs beautification — The visual presentation of code changes needs design polish

Related components

• crates/protocol/src/workspace_changes.rs
• Desktop app chat rendering components
• Desktop app diff/code review views