v4.5.2

What's Changed

• Add a full-GUI test tier: real window, real VTK, benzene end to end by @HiroYokoyama in #116
• 4.5.2: fix the first-heteroatom freeze, cache the OS theme query, run CI on dev branches by @HiroYokoyama in #117

Full Changelog: v4.5.1...v4.5.2