feat(core): add GlobeView pointer zoom option

[charlieforward9]

Summary

• add zoomAround: 'pointer' controller option for GlobeView
• keep existing center zoom behavior as the default
• refactor GlobeViewport ray/sphere math into shared helpers and add globe hit testing
• damp anchored zoom near the globe limb to reduce edge jumps

Why

Pointer-anchored zoom matches Google Earth-style interaction by preserving the globe point under the cursor/touch. Keeping it opt-in avoids changing default GlobeView behavior while letting apps choose that interaction model.

Split

Split out from #10303 so generic touch gesture work and GlobeView pointer anchoring can be reviewed independently.

Tests

• ./node_modules/.bin/vitest run --project browser test/modules/core/controllers/controllers.spec.ts test/modules/core/viewports/globe-viewport.spec.ts
• commit hook checks (test-fast)

[coveralls]

coverage: 83.444% (+0.01%) from 83.434% — NEW-HEAT:codex/globe-anchored-zoom into visgl:master