fix(core): clear pending native-scroll velocity timeout on destroy()

[cipherprofessor]

Fixes #541.

Problem

onNativeScroll schedules _resetVelocityTimeout (a 400ms setTimeout) whenever native-scroll velocity is nonzero, to reset velocity/isScrolling once the browser's native scroll settles. destroy() removed listeners and classes but never cleared that pending timeout.

If destroy() runs while that timeout is still pending, its callback fires anyway ~400ms later and sets isScrolling = false. That setter's private updateClassName() runs unconditionally on any change, and className's getter always starts from 'lenis' — so the base class gets re-added to rootElement well after the instance was destroyed and cleanUpClassName() already ran. Includes the common case of destroying an instance to honor prefers-reduced-motion, as described in the issue.

Fix

Clear _resetVelocityTimeout in destroy(), the same guard onNativeScroll already applies to itself at the top of its own body (clearing any previous pending timeout before scheduling a new one).

Testing

This repo has no test framework (no vitest/jest, no CI test step — confirmed by checking package.json scripts and searching for a test config). Verified with a standalone jsdom-based reproduction script exercising the actual, unmodified source end to end: minimal window/document polyfills (matchMedia, requestAnimationFrame, scrollTo/scrollY), autoResize disabled to avoid needing ResizeObserver, then the reporter's exact repro sequence — dispatch a native scroll, wait for the 'native' scrolling state to fire, destroy(), check the class immediately and again after 600ms.

Confirmed red against unmodified source (class returns after ~400ms, matching the reporter's exact numbers) and green after the fix (class stays cleared).

bun run build and bunx biome check are both clean.

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[darkestdarky-bot]

The diff adds a null-guarded clearTimeout for _resetVelocityTimeout in destroy(). This prevents a pending native-scroll velocity reset from firing after teardown and re-adding the root class. The change is minimal, confined to packages/core/src/lenis.ts, and matches the existing guard pattern; no correctness, scope, or standards issues are visible in the supplied hunk.

Review coverage: 16/16 diff lines supplied. Inline comments are limited to fully visible, valid right-side hunks. Reviewed commit: 2e14ce85aa482d869799df4a25a872bb74400676.