* feat(scene-graph)!: make a stroke a paint
Stroke extends Fill, so a stroke carries the same paint vocabulary a
fill does instead of a lone color. Every construction site now states
a solid paint type, which keeps today's behaviour exactly; rendering,
.fig conversion, and the stroke panel still read solid strokes only.
copyFill is generic over the paint shape so copyStroke reuses it
rather than repeating the deep copy of gradient stops, transforms and
pattern fields.
Groundwork for the gradient and image strokes in #797.
* test(scene-graph): cover a stroke's nested paint data in copyStroke
A stroke is a paint now, so its gradient stops and transform must copy
as deeply as a fill's; the fixture was solid and proved only the color
and dash pattern.
- useEditorSetup() / useEditorSetupWithClear() in tests/e2e/fixtures.ts
- Migrated 17 specs to shared fixture, removing ~300 lines of boilerplate
- Moved getSelectedNode/getSelectedNodes to shared store helpers
- Replaced inline getSelectedNode in 4 specs with shared import
- Test duplication: 329 → 308 clones (10.12% → 9.08%)
- Add &no-rulers to all E2E test URLs that use &no-chrome
- Regenerate snapshots without ruler ticks/selection badges
- Remove stale snapshot dirs from old test paths
- Expose window.openPencil.getStore() instead of a direct store property
- Update E2E helpers and specs to use the bridge getter
- Add lint coverage preventing direct window.openPencil.store access
- Route browser globals through src/app/window-api.ts instead of private __OPEN_PENCIL fields
- Move E2E tests to the public window.openPencil test API
- Add an oxlint rule banning direct window.__OPEN_PENCIL* access
- Replace browser store non-null assertions with explicit initialization guards
- Use expectDefined for optional test resources and tool results
- Clean low-count non-null assertions in font, icon, snap, OKHCL, and visual tests
- Configure oxfmt custom import groups for workspace, app, package, and test aliases
- Keep type imports grouped with their matching source category instead of one global tail group
- Expand the format script to cover formatter config, Vite files, and scripts
- Move top-level engine and e2e prefixed test files under domain folders
- Update fixture path helpers after moving render and pen tests
- Add lint coverage to prevent new top-level prefixed test files
- Refresh testing docs for the new fig and layout paths
