adjust gnome config

modules/gnome.nix

@@ -47,6 +47,7 @@ in
         disable-user-extensions = false;
         enabled-extensions = [
           "hidetopbar@mathieu.bidon.ca"
+          "just-perfection-desktop@just-perfection"
           "pano@elhan.io"
         ];
         favorite-apps = [
@@ -66,6 +67,17 @@ in
         mouse-sensitive-fullscreen-window = false;
       };
 
+      # Just Perfection extension configuration
+      "org/gnome/shell/extensions/just-perfection" = {
+        osd = false;  # Hide on-screen display notifications (including clipboard)
+      };
+
+      # Pano clipboard manager configuration
+      "org/gnome/shell/extensions/pano" = {
+        send-notification-on-copy = false;  # Disable notification toasts
+        play-audio-on-copy = false;  # Disable audio feedback on copy
+      };
+
       # Nautilus (GNOME Files) configuration
       "org/gnome/nautilus/preferences" = {
         show-hidden-files = true;
@@ -133,6 +145,7 @@ in
     # GNOME Shell extensions
     home.packages = with pkgs; [
       gnomeExtensions.hide-top-bar
+      gnomeExtensions.just-perfection
       gnomeExtensions.pano
     ];
   };