Resolve "Match left/right label padding in a branch's divergence graph"

What does this MR do and why?

This MR closes #436984 (closed) by adding padding to the right side label text in the branch divergence graph so the left and right side will visually match.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

• Checked across browsers (Chrome, Safari, Firefox, Arc)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Launch GDK
2. Open a project
3. Navigate to Code > Branches
4. View the divergence graph on right side of a branch card

Related to #436984 (closed)