Redesign Add/Edit User dialog and add role descriptions

[apodacaduron]

Description

Redesigns the Add/Edit User dialog into clearly labeled sections (User Details, Account Status, User Permissions), moves the field-enable pencil icons inline into their inputs, restyles the Group multi-select dropdown to show a description under each role with a checkmark/highlight for selected ones, and adds real descriptive text for the default Admin/DA/Mod roles (replacing the generic "System Role" placeholder) via a data migration. No functional/permission behavior changed — same fields, validations, and API calls as before.

How to Test

1. Go to Admin > Users.
2. Click New User — confirm the dialog shows sectioned layout (User Details / Account Status / User Permissions), the "Add User" button, and the Group dropdown shows role name + description with a checkmark on selected roles.
3. Edit an existing user — confirm the pencil icons next to Email/Username/Password are clickable even though those fields start disabled, and the footer button reads "Save" with a checkmark icon.
4. Toggle a few permission switches and roles, save, and confirm the change persists.
5. Run flask db upgrade and confirm Admin/DA/Mod roles get updated descriptions (only rows still set to "System Role" are touched).

[coderabbitai]

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