The unicode-linebreak crate treats the pipe character '|' as a break opportunity (BA/AL class). This causes ShapeSpan::build to split text like '|>' into separate ShapeWords. When these words are shaped independently, the font shaping engine cannot form ligatures that cross the word boundary.
This patch manually checks for the '|>' sequence during segmentation and skips the break opportunity, ensuring they remain in the same shaping run.
Added a unit test 'ligature_segmentation' to verify that '|>' remains a single word.
