feat: add notifications widget

widgets/notifications/icon.tsx

@@ -0,0 +1,21 @@
+import { Gtk } from "astal/gtk4";
+import Notifd from "gi://AstalNotifd";
+import { fileExists, isIcon } from "./notifd";
+
+export const Icon = (notification: Notifd.Notification) => {
+  const icon =
+    notification.image || notification.appIcon || notification.desktopEntry;
+  if (!icon) return null;
+  if (fileExists(icon))
+    return (
+      <box hexpand={false} vexpand={false} valign={Gtk.Align.CENTER}>
+        <image file={icon} />
+      </box>
+    );
+  else if (isIcon(icon))
+    return (
+      <box hexpand={false} vexpand={false} valign={Gtk.Align.CENTER}>
+        <image iconName={icon} />
+      </box>
+    );
+};