Refactor mouse button handling to use string literals instead of ButtonType constants; add debug print for screenshot action in web server

ai/compute.py

@@ -5,13 +5,13 @@ def press_mouse(mouse_input: MouseInput) -> None:
     """Presses mouse buttons at the given position."""
     x, y = mouse_input.x, mouse_input.y
     button = mouse_input.click_type
-    if button == ButtonType.LEFT:
+    if button == "left":
         pyautogui.click(x, y, button='left')
-    elif button == ButtonType.DOUBLE_LEFT:
+    elif button == "double_left":
         pyautogui.doubleClick(x, y)
-    elif button == ButtonType.RIGHT:
+    elif button == "right":
         pyautogui.click(x, y, button='right')
-    elif button == ButtonType.MIDDLE:
+    elif button == "middle":
         pyautogui.click(x, y, button='middle')
 
 def press_keyboard(keyboard_input: KeyboardInput) -> None: