D-Bus clients

All clients go through dbus.Connection (vendored basu / sd-bus). Poll getFd(), then drain with while (conn.process()) {}.

Connection

var conn = try otter_desktop.dbus.Connection.open(allocator, .session);
defer conn.deinit();
const fd = conn.getFd();

Client	Bus	Role
`UPower`	session	Battery state, on-battery detection
`PowerProfiles`	system	balanced / performance profiles
`Mpris`	session	Media metadata and transport control
`NetworkManager`	system	WiFi scan, connections, byte counters
`ScxLoader`	system	SCX scheduler switch (`scx_flow` for bar `falcond` widget)
`Screensaver`	session	Inhibit screen blanking
`SystemTray` / `StatusNotifierWatcher`	session	Tray icons and menus
`NotificationService`	session	`org.freedesktop.Notifications` for `otter-notifications`
`PolkitAgent`	system	Auth agent registration
`Fprintd`	system	Fingerprint reader
`Logind`	system	Session seat hints

Each service exposes startMonitoring(), subscribe(), getFd(), and process() for the same poll-loop pattern.

portal_file_chooser and portal_screencast wrap XDG desktop portal APIs when D-Bus is enabled.

With -Denable_dbus=false, types compile to void. Guard imports with desktop.has_dbus.