fix(export): return 501 with hint when Playwright browsers missing; nicer error toast in UI
fix(site-header): export primary/secondary buttons as named for SC safety; keep static props for compat
fix(portal): add DialogDescription for a11y; tidy preview dialog
fix(csats): avoid reinit state loops with timestamp guard
chore(prisma): default dev DB to prisma/db.dev.sqlite and log path
chore(auth): add dev bypass flags wiring (server/client) for local testing
dev: seed script for Convex demo data
