feat(tools): add brush raster painting

commands/document.test.ts

@@ -18,6 +18,7 @@ import {
   documentSetLayerClippingMaskCommand,
   documentSetLayerLockedCommand,
   documentSetLayerVisibleCommand,
+  documentUpdateAssetSourceCommand,
   documentUngroupLayerCommand,
 } from "./document";
 
@@ -52,6 +53,17 @@ describe("document commands", () => {
     ]);
   });
 
+  test("updates asset sources", () => {
+    const state = documentAddAssetCommand.execute(
+      { state: createInitialAppState("Test") },
+      { asset: { id: "asset-1", name: "Image", mimeType: "image/png", source: "old", intrinsicSize: { w: 100, h: 50 } } },
+    );
+
+    const next = documentUpdateAssetSourceCommand.execute({ state }, { assetId: "asset-1", source: "new" });
+
+    expect(next.document.assets[0]?.source).toBe("new");
+  });
+
   test("adds image layers to artboards", () => {
     const state = documentAddArtboardCommand.execute(
       { state: createInitialAppState("Test") },