Add moderation TUI

This ended up way fancier than I imagined.

modui/notification.py

@@ -0,0 +1,8 @@
+from textual.widgets import Static
+
+class Notification(Static):
+    def on_mount(self) -> None:
+        self.set_timer(3, self.remove)
+
+    def on_click(self) -> None:
+        self.remove()