Hollow heads draw as rings (the open arrow as a chevron) and closed paths get
no heads. The stroke stops under each head, so it never shows through a hollow
head or past the tip; stroke.set {arrowAlign: "extend"|"tip"} chooses whether
the tip extends past the end point (default) or sits on it with the stroke
shortened. Line and heads share one paint box (a gradient runs on into the
head) and take the stroke and object opacity once, as one layer on the canvas
and one group in PDF. StrokeLayer.arrow_align is a new defaulted field, so
older files load unchanged. The Stroke panel's Align buttons get two generated
icons and are disabled when the stroke has no head.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Arrowheads, width-profile outlines and dashed line outlines now come from
vectorcraft_effects::stroke (stroke_pieces, line_outline, width_outline), used by
the canvas and PDF export alike; the renderer caches profile outlines too. Width
profiles are a doc-level catalogue (WidthProfile::PRESETS, preset, preset_id,
id_of) shared by stroke.set and the Stroke panel; stroke.set rejects unknown
profile ids and its params doc lists the arrowhead names.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
