feat(pointer): add createPointerVelocity kinematics and momentum decay tracker

[deny-dz]

Summary

This PR introduces createPointerVelocity to @solid-primitives/pointer:

• Kinematic Pointer Velocity Tracking: Calculates instantaneous pointer velocity vectors (vx, vy, and scalar speed in pixels per second) from raw pointer movement deltas ($\vec{v} = \frac{\Delta \vec{p}}{\Delta t}$).
• Automatic Idle Momentum Decay: Automatically zeroes velocity when pointer movement pauses, essential for gesture inertia, fling physics, and interactive pan-zoom velocity calculations.

Changes

• packages/pointer/src/velocity.ts: createPointerVelocity implementation.
• packages/pointer/src/index.ts: Re-export velocity helpers.
• packages/pointer/test/velocity.test.ts: Vitest test suite.
• .changeset/pointer-velocity-momentum.md: Minor changeset.

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🦋 Changeset detected

Latest commit: 469ca1e

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/pointer	Minor

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📥 Commits

Reviewing files that changed from the base of the PR and between c7b608c and 469ca1e.

📒 Files selected for processing (4)

• .changeset/pointer-velocity-momentum.md
• packages/pointer/src/index.ts
• packages/pointer/src/velocity.ts
• packages/pointer/test/velocity.test.ts

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