misc: replace Any with precise types

Curses screens, windows and pads are typed as curses.window, and the
widgets that may get no parent window take curses.window | None.

- EventHandler is generic over a ParamSpec, so each handler declares
  the arguments it passes, and MenuView is generic over the item its
  on_confirm hands out. Choice callbacks take no arguments.
- Scrollable is generic over its items, which DataTable and ListBox
  fix to tuple[str, str] and str.
- random.choice() and choice_low() are generic over the sequence, so
  the casts at their call sites are gone. BasicUserInterface.menu()
  and util.first() are generic too.
- Signal callbacks and their payloads are Callable[..., object] and
  object, since emit() only forwards them.
- JSON values in game_data are object and narrowed by isinstance,
  and data files are Traversable.
- Signal handlers take an int and a FrameType | None, and
  list_players() takes a TextIO.
- The focus_standout() context managers return
  Generator[None, None, None].

Any remains in three places: Player.__setstate__, whose pickled
__dict__ holds values of every type; Focusable.__init__, a mixin that
passes *args and **kwargs through to the next class; and the values
load_game_data() collects, whose element type depends on the field
each one fills.

pqcli/__main__.py

@@ -1,7 +1,7 @@
 import argparse
 import sys
 from pathlib import Path
-from typing import Any
+from typing import TextIO
 
 from xdg_base_dirs import xdg_config_home
 
@@ -84,7 +84,7 @@ def parse_args() -> argparse.Namespace:
     return parser.parse_args()
 
 
-def list_players(roster: Roster, file: Any | None = None) -> None:
+def list_players(roster: Roster, file: TextIO | None = None) -> None:
     for i, player in enumerate(roster.players, start=1):
         print(f"{i}. {player.name}", file=file)