The shared `.kma-button` rule used `white-space: nowrap` + a fixed
height, so long MFA/SSO/sign-in option labels (e.g. "Get a verification
code from the Google Authenticator app") overflowed the card. Switch
buttons to `min-height` and `overflow-wrap: anywhere` so labels wrap and
the row grows to fit. Extend two demo MFA options with longer labels so
the wrapping case is exercised when scrubbing through States.

Configures Vercel to build the library before the demo app and
output from packages/demo/dist, so workspace:* dependency resolves
correctly in CI.

Co-authored-by: Cursor <cursoragent@cursor.com>