feat(terminal): replace GNOME Console with Ghostty

Replace the default GNOME Console terminal with Ghostty by adding it to home packages, configuring it as the default terminal application via dconf settings, and excluding GNOME Console from installed packages.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

home.nix

@@ -15,12 +15,13 @@
     python3
     nmap
     file
-    freerdp  
+    freerdp
     bitwarden-desktop
     bitwarden-cli
     lunarvim
     minicom
     kicad
+    ghostty
     gnomeExtensions.blur-my-shell
     gnomeExtensions.just-perfection
     gnomeExtensions.arc-menu
@@ -97,6 +98,14 @@
     size = 24;
   };
 
+  # Set Ghostty as default terminal
+  dconf.settings = {
+    "org/gnome/desktop/default-applications/terminal" = {
+      exec = "ghostty";
+      exec-arg = "";
+    };
+  };
+
   # Manage your git configuration declaratively
   programs.git = {
     enable = true;