do not suppress KeyboardInterrupts in CLI loader

src/dopt_basics/cli.py

@@ -24,6 +24,7 @@ class LoadingAnimation:
         self.ending_text = ending_text
         self.timeout = timeout
         self.done: bool = False
+        self.keyboard_interrupt: bool = False
 
         self._isatty = sys.stdout.isatty()
         self._do_animation = bool(sys.stdout.isatty())
@@ -53,16 +54,15 @@ class LoadingAnimation:
         exc_type: type[Exception],
         exc_value,
         tb,
-    ) -> bool:
+    ) -> None:
         if exc_type is not None:
             self.stop(interrupt=True)
             if exc_type is KeyboardInterrupt:
+                self.keyboard_interrupt = True
                 print("Operation cancelled by user. (KeyboardInterrupt)", flush=True)
-                return True
-            return False
+            return
 
         self.stop()
-        return False
 
     def _animation(self) -> None:
         for frame in cycle(self.frames):
@@ -100,6 +100,6 @@ def default_loading(func: Callable[P, T]) -> Callable[P, T]:
         with LoadingAnimation(loading_txt, ending_text):
             res = func(*args, **kwargs)
 
-        return res  # type: ignore
+        return res
 
     return wrapper