Mod randomizer V6.9

What's Changed

• Refactor popup/sidebar CSS into shared GX Neon style modules by @Ido-Riko with @Copilot in #2
• Reduce popup/background churn and eliminate redirect timer leaks in mod list flows by @Ido-Riko with @Copilot in #3
  This version involves performance improvements (using sets, and fixing timer leaks) and reordering the css to avoid redudant copy pasted code.

New Contributors

• @Ido-Riko with @Copilot made their first contribution in #2

Full Changelog: V6.8...V6.9