feat(scroll): add createSmoothScroll with physics interpolation and velocity tracking

[deny-dz]

Summary

This PR introduces createSmoothScroll to @solid-primitives/scroll:

• Inertial Physics Smooth Scrolling: Drives smooth, progressive convergence to target scroll coordinates using momentum physics damping.
• Velocity Vector Accessors: Exposes reactive velocityX and velocityY signals in real time during active scroll events.
• Interactive Controls: Exposes scrollTo({ x, y }) and stop() methods with automatic unmount frame-loop cancellation.

Changes

• packages/scroll/src/smooth.ts: createSmoothScroll implementation.
• packages/scroll/src/index.ts: Re-export smooth scroll utilities.
• packages/scroll/test/smooth.test.ts: Vitest test suite.
• .changeset/scroll-smooth-physics.md: Minor changeset.

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🦋 Changeset detected

Latest commit: ba914d7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solid-primitives/scroll	Minor

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📥 Commits

Reviewing files that changed from the base of the PR and between c7b608c and ba914d7.

📒 Files selected for processing (4)

• .changeset/scroll-smooth-physics.md
• packages/scroll/src/index.ts
• packages/scroll/src/smooth.ts
• packages/scroll/test/smooth.test.ts

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