CapsuleGeometry: Change length param to height, fix UVs

[mkeblx]

Description

Followup to: #30868, with a few improvements.

• change length to height (matching heightSegments, and other geometries; see: CapsuleGeometry: Add heightSegments parameter #30868 (comment))
• fix capSegments parameter, previously was off by 2x( see: CapsuleGeometry: Add heightSegments parameter #30868 (comment))
• fix UVs: quite non-ideal before previous patch, and I think uniform distribution along path length makes sense (see images below; see some discussion here: CapsuleGeometry: Add heightSegments parameter #30868)
• documentation fixups (forgot heightSegments on translations)

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UV comparison:

Before:

After:

This contribution is funded by Samsung

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.49 78.38	336.49 78.38	+0 B +0 B
WebGPU	542.05 150.13	542.05 150.13	+0 B +0 B
WebGPU Nodes	541.51 150.03	541.51 150.03	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	465.42 112.22	465.42 112.22	+0 B +0 B
WebGPU	614.89 166.17	614.89 166.17	+0 B +0 B
WebGPU Nodes	569.88 155.58	569.88 155.58	+0 B +0 B

[Mugen87]

I'm glad to see the dependency to LatheGeometry is removed! Using LatheGeometry was a quick way to implement a capsule but this new approach results in more usable and correct vertex data.