Add desktop database and icon cache refresh

postinstall.sh

@@ -651,6 +651,10 @@ StartupNotify=true
 StartupWMClass=antigravity-ide
 EOF
     
+    log_info "Refreshing desktop databases and icon caches..."
+    sudo update-desktop-database /usr/share/applications || true
+    sudo gtk-update-icon-cache -f -q /usr/share/icons/hicolor || true
+
     log_info "Antigravity App and IDE installed successfully."
 }