PR #98 added react-day-picker via shadcn/ui Calendar but the package
was not yet installed in node_modules. This broke 5 test files at import
resolution time:
- src/App.test.tsx
- src/components/Editor.test.tsx
- src/components/Inspector.test.tsx
- src/components/InspectorPanels.test.tsx
- src/components/DynamicPropertiesPanel.test.tsx
Fix: add a vitest mock for react-day-picker in the global test setup
(same pattern as the existing react-virtuoso mock). DayPicker renders
a real calendar widget that requires DOM APIs unavailable in jsdom —
mocking it to null is the correct approach for unit/integration tests
that don't test date-picker behavior specifically.
Before: 5 failed | 48 passed (764 tests)
After: 0 failed | 53 passed (929 tests)
5ef59a8716