nixos: remove taffybar ecosystem follows and fix bitwarden rename

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>

nixos/kat.nix

@@ -2,7 +2,7 @@
 makeEnable config "myModules.kat" false {
   environment.systemPackages = with pkgs; [
     obsidian
-    bitwarden
+    bitwarden-desktop
     code-cursor
     obsidian
     windsurf