Paste now targets the selected frame/group/component/section instead of
always placing nodes on the page root, matching Figma's behavior:
- Single container selected: paste as child
- Non-container child selected: paste as sibling in its parent
- Entered container (double-click): paste inside it
- Nothing or multiple nodes selected: paste on the page
Also applies to image paste via placeImageFiles.
Fixes#79
- Move newly split tests under explicit domain subfolders
- Update nested helper imports after the moves
- Add a lint guard against repeating existing sibling domains as filename prefixes
- Extract color picker fill comparison helpers
- Guard derived text assertions without optional chains
- Split resize math into smaller helper functions
- Remove the remaining complexity test exceptions
- Remove remaining test non-null assertions and delete the broad test override
- Add explicit guards for canvas, design panel, auto-layout, SVG, Kiwi, hit-test, scene graph, text editor, and clipboard tests
- Validate check plus affected engine and E2E coverage
- Replace clipboard, variable, centerline, layout, menu, and text formatting assertions with explicit guards
- Use expectDefined and getNodeOrThrow instead of postfix non-null assertions
- Validate affected engine and E2E 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
- Merge structural lint rules into oxlint.json and remove the second config file
- Add #tests/* path aliases and rewrite deep test helper imports
- Ban new deep parent-relative imports through the shared lint config
- Move clipboard.test.ts into focused import, bounds, HTML encoding, and fixture roundtrip files
- Add a shared clipboard graph helper for import tests
- Preserve all 29 clipboard tests after the split
