~jaro/balkon

ref: 3e3fef4440b5d982144bdb4b13a3d784ba686233 balkon/src/Data d---------
Fix documentation: missing boxSpacing.
Describe box edges with extensible type.
Expose piecewise paragraph construction.
Consolidate tree types into one.
Handle ancestor boxes in rich layout.
Add ancestor boxes to interface.
Implement finding box edges.
Allow extracting ResolvedBox from WithSpan.
Implement set operations on [ResolvedBox].
Allow extracting spacing from ResolvedBox.
Store direction in ResolvedBox.
Add required textDirection to TextOptions.
Link ResolvedSpan to boxes.
Use ResolvedBox when flattening trees.
Define ResolvedBox.
Improve code readability with type alias.
Separate WithSpan for sharing with other modules.
Deduplicate pagination code.
Implement Rich pagination.
Qualify Plain pagination.
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