feat: add core domain model foundations

core/base-layer.ts

@@ -0,0 +1,16 @@
+import type { Transform } from "./geometry";
+import type { LayerId } from "./id";
+
+export type LayerClippingMask = {
+  maskLayerId: LayerId;
+};
+
+export type BaseLayer = {
+  id: LayerId;
+  name: string;
+  visible: boolean;
+  locked: boolean;
+  opacity: number;
+  transform: Transform;
+  clippingMask?: LayerClippingMask;
+};