Keep commit history at the sidebar bottom, expand it to half the Git content area, and preserve independently scrolling panes when resizing. Use the shared refresh action and remove the redundant changed-files border.
Load Git status on project changes regardless of restored sidebar selection, and keep status and error fallback scoped to the selected project.
Release note: 提交历史默认贴底,展开占用一半内容区,支持拖拽调整并统一使用顶部刷新。切换项目后自动识别 Git 工作区,无需手动刷新。