feat: add tray and time widget

widget/bar/time.tsx

@@ -0,0 +1,12 @@
+import { GLib, Variable } from "astal";
+
+export const Time = () => {
+  const time = Variable("").poll(
+    1000,
+    () => GLib.DateTime.new_now_local().format("%I:%M:%S %p")!,
+  );
+
+  return (
+    <label cssClasses={["time"]} onDestroy={() => time.drop()} label={time()} />
+  );
+};