The eyedropper (`appearance.copyFrom`), `graphicStyle.new` and `graphicStyle.apply` move placed gradients so they
sit at the same place relative to each target's bounds (type: its layout box in text space) instead of where the
source had them; the paint defaults take the gradient unplaced, so new art fits it. Model: `GradientGeom::rebase`
/ `GradientPaint::rebase` (color), `Appearance::rebase_gradients` (strokes relative to their inflated boxes) and
`GraphicStyle::unit_box`: new styles store placed gradients in unit-box space; styles from older files keep
document coordinates and apply as before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>