* fix(ui): serve migrated-page links unprefixed on the dev server
migratedHref and legacyPageHref always prepended /ui, which is where the
proxy mounts the static export but not where next dev serves the app
(basePath is empty; the app lives at the root on localhost:3000). Every
sidebar link to a migrated page and every ?page= bookmark redirect
therefore 404'd in dev, and would do so for each page cut over in the
App Router migration.
uiBase now returns the bare root under NODE_ENV=development. The check
is inlined at build time, so production output is unchanged for both
the default /ui mount and server_root_path deployments.
* test(ui): pin NODE_ENV in production-mode migratedPages tests
The production-mode describes relied on vitest defaulting NODE_ENV to
test; a developer with NODE_ENV=development exported in their shell
would see them fail. Stub it explicitly so the suite is deterministic
regardless of ambient environment.
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