feat(transform): add transform session commands

editor/state.ts

@@ -2,6 +2,7 @@ import type { ImageDocument } from "@core/document";
 import type { Angle, Size, Vec2D } from "@core/geometry";
 import type { ArtboardId, LayerId } from "@core/id";
 import type { ToolState } from "./tools";
+import type { TransformSession } from "./transform";
 
 export type ViewportState = {
   center: Vec2D;
@@ -19,6 +20,7 @@ export type EditorState = {
   viewport: ViewportState;
   selection: SelectionState;
   tools: ToolState;
+  transformSession?: TransformSession;
 };
 
 export type AppState = {