feat: 接入新动作 update_canvas

app/actions/registry.py

@@ -8,6 +8,7 @@ from app.actions.delete import DeleteHandler
 from app.actions.move import MoveHandler
 from app.actions.resize import ResizeHandler
 from app.actions.update import UpdateHandler
+from app.actions.update_canvas import UpdateCanvasHandler
 from app.schemas.actions import Action
 from app.schemas.screen import Screen
 
@@ -18,6 +19,7 @@ ACTION_HANDLERS: dict[str, BaseActionHandler[Any]] = {
     "move": MoveHandler(),
     "resize": ResizeHandler(),
     "update": UpdateHandler(),
+    "update_canvas": UpdateCanvasHandler(),
 }