~jaro/balkon

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.
Test layout with mixed font sizes.
Deduplicate pagination code.
Test Rich pagination.
Implement Rich pagination.
Qualify Plain pagination.
Test Rich line wrapping.
Test Rich layout.
Limit internal imports in interface tests.
Make paginateAll generic.
Implement piecewise paragraph construction.
Refactor pagination to allow rich layout.
Convert plain layout to a wrapper over rich layout.
Deprecate ParagraphConstruction.
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