rename ui to clan-app and move clan-app one layer up

pkgs/clan-app/install-desktop.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+
+if ! command -v xdg-mime &> /dev/null; then
+  echo "Warning: 'xdg-mime' is not available. The desktop file cannot be installed."
+fi
+
+ALREADY_INSTALLED=$(nix profile list --json |  jq 'has("elements") and (.elements | has("clan-app"))')
+
+if [ "$ALREADY_INSTALLED" = "true" ]; then
+  echo "Upgrading installed clan-app"
+  nix profile upgrade clan-app
+else
+  nix profile install .#clan-app
+fi
+
+
+# install desktop file
+set -eou pipefail
+DESKTOP_FILE_NAME=org.clan.app.desktop
+
+xdg-mime default "$DESKTOP_FILE_NAME"  x-scheme-handler/clan