feat: transition from Hyprland to GNOME desktop environment

- Updated Bellerophon configuration to include GNOME desktop settings and packages.
- Added GNOME-specific packages and extensions for enhanced user experience.
- Introduced scripts for display management tailored for ZenBook Duo under GNOME.
- Implemented systemd services for automatic display management and backlight control.
- Integrated UWSM for improved session management in Hyprland.
- Enhanced lid monitoring and USB display management scripts for ZenBook Duo.
- Configured keyring support for GNOME and integrated it with PAM.
- Updated display manager settings to enable GDM for GNOME sessions.

hosts/common/optional/greetd.nix

@@ -9,6 +9,22 @@
     };
   };
 
+  # Enable the GNOME Keyring daemon system-wide
+  services.gnome.gnome-keyring.enable = true;
+
+  # Enable GNOME Keyring support in PAM
+  security.pam.services.greetd.enableGnomeKeyring = true;
+  security.pam.services.login.enableGnomeKeyring = true;
+
+  # Ensure gnome-keyring daemon runs for user sessions
+  systemd.user.services.gnome-keyring = {
+    wantedBy = ["default.target"];
+    serviceConfig = {
+      ExecStart = "${pkgs.gnome-keyring}/bin/gnome-keyring-daemon --start --foreground --components=pkcs11,secrets,ssh";
+      Restart = "on-abort";
+    };
+  };
+
   # Disable conflicting getty services on tty1
   systemd.services."getty@tty1".enable = false;
   systemd.services."autovt@tty1".enable = false;