feat(editor): add tool interaction state

editor/index.ts

@@ -1,4 +1,6 @@
 export type { AppState, EditorState, SelectionState, ViewportState } from "./state";
+export type { InteractionMode, ToolId, ToolState } from "./tools";
+export { initialToolState } from "./tools";
 export { createInitialAppState, initialEditorState } from "./initial-state";
 export type { AppStore, StateListener } from "./store";
 export { createAppStore } from "./store";