Windows parity: Line/shape anti-aliasing grid lines and dashed/preview paths still plain GDI #752

Current reconciliation - 2026-11-09

The 2026-10-13 narrowed scope below remains authoritative: exact equality with Core Graphics output is NOT required. The requirement is smooth anti-aliased remaining grid/dashed/preview paths and a paired macOS edge-style comparison.

PR #962 earns a bounded Wire/Create outcome, not all edge styles or raster quality. Still open / Partial: the remaining rendering paths and matched style/state captures. A live applied edge or geometry/paint-unit pass does not complete those visual obligations.

The original report, acceptance criteria and historical evidence below are preserved; the dated scope/progress above supersedes obsolete missing-feature claims.

Is your feature request related to a problem?
Parity row Line/shape anti-aliasing (Accessibility, input, and visual behavior) in investigation/ui-parity-matrix.md is Partial.

macOS: Smooth, anti-aliased lines, curves and rounded corners.

Windows today: Anti-aliased edges and shapes for most canvas drawing.

Gap: Axis-aligned grid lines and dashed/preview paths remain plain GDI; all edge styles and equality with Core Graphics are unproven.

Describe the solution you'd like
Move the remaining paths to the anti-aliased renderer, then compare edge styles against macOS captures.

Describe alternatives you've considered
N/A

Additional context
This is an implementation gap: work remains in the product before the row can be validated. Parity status and the beta25 Dev Box review are recorded in #719.