feat(users): passwordless user creation via emailed set-password link, display full name instead of username

Admins now create users with a name + email (no password) and role;
a Send Email action (per-user, also reusable for resets) issues a
one-time token and POSTs it to an admin-configurable webhook URL —
intended for a Power Automate flow that delivers the actual email.
The old admin-sets-the-password flow is kept server-side
(LegacyUserCreateWithPassword) but no longer wired into the UI.

Every user-facing surface (top bar, sidebar, user management, audit
log, assignee pickers, dispute notifications) now shows full_name
instead of username, falling back to username when unset.

Also fixes long attack_procedure/expected_detection/suggested_text
text overflowing its container in the template review panels and
Red/Blue team fields (missing break-words on whitespace-pre-wrap
blocks).

backend/app/schemas/auth.py

@@ -39,6 +39,7 @@ class UserOut(BaseModel):
     id: uuid.UUID
     # username: str
     username: str
+    full_name: str | None = None
     # Assign email = None
     email: str | None = None
     # role: str