Replace the header "Byt lösenord" link with an Inställningar menu for
changing email or password. Email changes are two-step: request with
password, confirmation link to the new address, then password again on
confirm so a wrong inbox cannot take over the account.
- Backend: EmailChangeService, V10 email_change_tokens, confirm API
- Frontend: ChangeEmailPage, ConfirmEmailChangePage, header dropdown
- E2E: account-settings round-trips, Mailpit verification, wrong-password guard
- Flyway: V9 restore for dev DBs, CI migration checks, V10 for email tokens
Co-authored-by: Cursor <cursoragent@cursor.com>