/ is the highest-traffic route but was missing from both the public-route
instrumentation and the JS size budgets, so a payload regression there could
never fail the build. It is now wrapped in withPublicPagePerformance and
budgeted alongside the other public routes.
optimizePackageImports listed date-fns, which is not a dependency (a no-op),
while omitting the barrel-heavy packages that are actually imported: motion,
@dnd-kit/core, @dnd-kit/sortable and @tanstack/react-virtual.