The per-line tracking compensation in text_geom used only the animators'
Line Anchor, which defaults to 0% (left) when no animator has one, so
tracking on centred or right-aligned text pushed the line to the right
instead of spreading it around its alignment point.
Without a Line Anchor, a line now grows from where its own paragraph's
alignment pins it: 50% for centred, 100% for right-aligned (a justified
paragraph by its last line), read per paragraph rather than from the
document. The Line Anchor property still overrides it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
