JwtStrategy read `role` straight from the JWT payload, so a role change
or deactivation stayed ineffective until the 1h access token expired:
after a promotion the menus showed (via /users/me) but admin endpoints
returned 403 because RolesGuard still saw the old token role; after a
demotion the old admin kept API access. Load the user from the DB in
validate() and use the current role; reject inactive users.
Frontend: poll /users/me in the dashboard layout (+ on window focus) so
the sidebar reflects role changes without a hard reload, and redirect
away from pages the new role can no longer reach.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
keyhan
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