Account settings

Build Racecamp's account settings: profile, security (password change signs out other
sessions), notification preferences, sessions with per-session revoke, and a
danger-zone account deletion with confirmation. Labelled section nav, server-style
validation. Nitro Kit, dummy content.

Make account management feel built-in, not bolted on. Build the account settings area
for Racecamp, a project management app from 27 Seagulls: profile (name and email), security
(change password, and confirm it signs out other sessions), notification preferences,
active sessions with a per-session Revoke, and account deletion behind a clear danger
zone with a confirmation step.

Stay on a stable labelled section navigation; every form validates and re-renders with
errors like a real server round-trip. This is a UI showcase — dummy content, throwaway
state, nothing persists. Use Nitro Kit components throughout.