Hide scrollbars on mobile

Editor assessment

The subject is crisp: scrollbars hidden on mobile. The fix type suits the responsive defect, and the absent scope is tolerable for a cross-cutting visual fix. The body is squashed debris — a package-build fix, its revert with a standard revert notice, and a requested-changes note — that documents PR churn without explaining which overflow condition caused the scrollbars or how they are suppressed now. The PR reference is well-formed. Understandable at the headline level, but the process-noise body means the mechanism behind the fix is never stated.