This commit improves the visualization of diffs in the CodeViewer and makes several adjustments to the interface, which enhances the user experience.
Changes:
- Add padding to code lines and update line colors for context, split, and diff classes.
- Modify background color values for addition and deletion markers.
- Add contrasting text color to addition inner diffs: white.
- Update lineClass assignment in DiffViewer.svelte to reflect new colors.
- Reorganize project overview page: move work-in-progress sidebar to the right.
- Rename class "work-in-progress-sidebar" to "side-panel" for clearer naming convention.
