The notification item component was incorrectly accessing `notif.username` directly instead of `notif.username.name`, causing undefined values to appear in the notification display when the username field contained an object with a `name` property. Added a console.info statement for debugging and corrected the property chain to properly extract the display name from nested object structures.
- Add notifyAuthChange() call after successful token validation in setAuthFromToken
- Fetch user profile during login to obtain canonical username instead of using raw input
- Update both authData and currentUser objects with resolved username from profile API
- Handle profile fetch failure gracefully by falling back to provided username
