feat(editor): add tool interaction state

editor/state.ts

@@ -1,6 +1,7 @@
 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";
 
 export type ViewportState = {
   center: Vec2D;
@@ -17,6 +18,7 @@ export type SelectionState = {
 export type EditorState = {
   viewport: ViewportState;
   selection: SelectionState;
+  tools: ToolState;
 };
 
 export type AppState = {