[geo-layers] Add lower zoom tile prefetching#10295
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Summary
Adds opt-in lower-zoom tile prefetching to TileLayer/Tileset2D via
prefetchZoomDeltaandprefetchTileRadius.Prefetched tiles are requested hidden and at lower priority than selected/visible tiles, giving surrounding lower-resolution coverage without letting prefetch work block the viewport.
Validation
npx vitest run --project headless test/modules/geo-layers/tileset-2d/tile-2d-header.spec.ts test/modules/geo-layers/tileset-2d/tileset-2d.spec.tsStacked on #10294.