Testing

Config: vitest.config.js — Node environment, test/**/*.test.js.

Run: npm test (or npm run check).

File	Focus
`models.test.js`	Event/board normalization, coverage, packing, todos derivation
`policies.test.js`	Bootstrap policy, role normalization, `commitTransaction`
`shared-board.test.js`	Share access state machine
`drag.test.js`	Long-press, scroll cancel, rAF coalescing, edge scroll
`grid-layout.test.js`	Geometry, header sync, pack/merge drag view
`grid-cursors.test.js`	Coordinate conversion + cursor keys
`time.test.js`	Grid time, planner day, snapping
`print-prefs.test.js`	Defaults, normalization, storage failures
`og-meta.test.js`	Crawlers, sanitization, privacy, HTML tags
`og-handler.test.js`	`/api/og` writes PNG; rejects non-GET
`vercel-spa.test.js`	No `cleanUrls`; SPA + API rewrites

Prefer pure modules so tests do not need Instant or a browser.