Culling viewport

[kaznaan]

Culling viewport in tldraw side to reduce amount of DOM.

[cursor]

PR Summary

Medium Risk
Changes which shapes are mounted/rendered based on viewport culling, which may cause offscreen shapes/indicators to disappear unexpectedly or introduce edge cases around selection/editing visibility and re-render behavior.

Overview
Adds a new public Editor.getVisibleRenderingShapes() computed that filters getRenderingShapes() by the current culling set (getCulledShapes()).

Updates DefaultCanvas and DefaultShapeIndicators to use this new method instead of getRenderingShapes(), reducing mounted DOM/indicators to viewport-visible shapes, and updates the API report accordingly.

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