feat: scroll page when Reorder container does not have overflow auto or scroll

[lgaspari]

Fixes #3469

Summary

• When closest scrollable element is either document.body or document.documentElement, then:
  • Max scroll is determined by window's innerWidth or innerHeight based on axis
  • Current scroll is determined by window's scrollX or scrollY based on axis
  • Scroll is performed on window invoking scrollBy method

Test plan

• Cypress tests for reorder-auto-scroll pass
• Manual testing with scrollable container
• Verify existing Reorder functionality unchanged

Evidence

Screen.Recording.2026-01-23.at.19.25.14.mov

[lgaspari]

Hey @mattgperry, sorry for the direct ping. When you have a moment, would you be able to take a look at this PR?

It's my first time contributing, so I'd really appreciate any feedback in case I missed something. I'm happy to make adjustments if needed to get this merged. LMK!

Thanks a lot for your time!
Lean

[mattgperry]

Thanks for the PR! Next week is maintenance week so I’ll be taking a good look then!

[mattgperry]

Awesome contribution! Thanks for the PR