Remove top-level gtk-sni-tray, gtk-strut, status-notifier-item,
dbus-menu, and dbus-hslogger inputs that only existed as follows
targets. Let taffybar and imalison-taffybar resolve their own
ecosystem deps, eliminating cascading lock update headaches.
Also rename bitwarden -> bitwarden-desktop in kat.nix (nixpkgs rename).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>