misc: improve mypy health

pqcli/ui/curses/widgets/menu.py

@@ -1,4 +1,5 @@
 import curses
+import curses.ascii
 import typing as T
 
 from pqcli.ui.curses.util import KEYS_DOWN, KEYS_UP

pqcli/ui/curses/widgets/scrollable.py

@@ -92,5 +92,5 @@ class Scrollable(WindowWrapper):
         except curses.error:
             pass
 
-    def _render_impl(self) -> None:
+    def _render_impl(self, h: int, w: int) -> None:
         raise NotImplementedError("not implemented")