In the baseline branch of the flow layout only an item with a text baseline got one; any other
layer stayed at the top of the line. A layer without a text baseline now uses its bottom edge, as
the help center's figure shows ("the bottoms of the icon and the word home are aligned on the red
line"): an icon next to a text sits on the text's baseline, a layer reaching below it moves the
text down, and a line with no text lines the layers' bottoms up (CSS does the same).
Tests: alignment_rules (three cases), baseline_alignment_horizontal, engine
baseline_alignment_puts_an_icons_bottom_on_the_text_baseline. Docs: auto-layout-parity row,
status line and revision history.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>