python_payload: Fix broken type hints

python_payload/apps/appearance/__init__.py

@@ -4,6 +4,7 @@ from st3m import settings
 import leds
 import sys_display
 from st3m.ui import colours, led_patterns
+from ctx import Context
 
 
 class App(Application):

python_payload/apps/graphics_mode/__init__.py

 from st3m.application import Application
 import math, random, sys_display
+from ctx import Context
 
 
 class App(Application):

python_payload/apps/mandelbrot/__init__.py

 from st3m.application import Application
 import sys_display, math, random
+from ctx import Context
 
 
 class App(Application):

python_payload/apps/w1f1/k3yboard.py

@@ -6,7 +6,7 @@ from ctx import Context
 import st3m.run
 from st3m import Responder, InputState
 from st3m.application import Application, ApplicationContext
-from st3m.goose import ABCBase, Enum
+from st3m.goose import ABCBase, Enum, Optional
 from st3m.ui.view import BaseView, ViewManager
 from st3m.utils import tau
 
@@ -57,7 +57,7 @@ class TextInputModel(Model):
     def input_right(self) -> str:
         return self._input_right
 
-    def move_cursor(self, direction: self.CursorDirection) -> None:
+    def move_cursor(self, direction: "TextInputModel.CursorDirection") -> None:
         """
         Moves the cursor one step in specified direction. Any pending input will be committed beforehand.
         """