[SandObserver]

Summary

• Allow the import link in the empty dashboard scroll test to end up to 1px past the 120px viewport, so WebKit's whole-pixel scroll rounding does not fail it.

Testing
All green. The reflow specs passed 5 repeats in Chromium and WebKit.

Changelog

Checklist

• Stays within the project constraints: one container, no runtime dependencies, no build step (see CONTRIBUTING.md).
• Tests added or updated for new logic, and the full suite, lint, and typechecks pass.
• Docs updated if behavior or configuration changed.