Auth gates redirected to a bare /login with no memory of where the
user was headed, and the login page always sent them to /dashboard
afterward — so opening the /m PWA while signed out landed you on the
main dashboard instead of back on /m. Both gates now pass ?next=,
and login honors it (falling back to /dashboard if missing/unsafe).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
