- add `ConfirmEmailChangePage.client.js` for email change token confirmation
- add `emailChange.js` core utility to generate and verify email change tokens
- add `EmailChangeConfirmEmail.js` and `EmailChangeNotifyEmail.js` email templates
- update `UserEditModal` to handle email changes with password verification for self-edits
- update `ProfilePage` to support email change initiation
- update `UsersPage` to pass `currentUserId` to `UserEditModal`
- add email change API endpoints in `auth/api.js` and `auth/email.js`
- register `ConfirmEmailChangePage` in `AdminPage.client.js`
BREAKING CHANGE: sup config now derives entries from package.json#exports and a server/client glob instead of manual lists; module structure follows flat + barrel convention with .server.js/.client.js runtime suffixes
hykocx