The role <select> used a manual value=/@onchange pattern that parsed
e.Value and returned silently when the parse failed, so changing a role
did nothing and showed no message. Switch to @bind + @bind:after so the
framework handles the enum conversion, and log/verify the persisted role
in UpdateRoleAsync (now returns the previous role) for diagnosis.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
kawa