refactor: reorganize src structure

src/core/scene.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, test } from "bun:test";
+import { HttpError, MAX_SCENE_BYTES, emptyScene, normalizeScene, parseJsonBody } from "./scene";
+
+describe("scene helpers", () => {
+  test("creates empty scenes with dark theme by default", () => {
+    const scene = emptyScene();
+
+    expect(scene.appState.theme).toBe("dark");
+  });
+
+  test("normalizes volatile app state fields", () => {
+    const scene = normalizeScene({
+      elements: [],
+      appState: {
+        selectedElementIds: { one: true },
+        viewModeEnabled: false,
+      },
+      files: {},
+    });
+
+    expect(scene.appState.selectedElementIds).toBeUndefined();
+    expect(scene.appState.viewModeEnabled).toBe(false);
+  });
+
+  test("rejects oversized payloads", () => {
+    const text = "x".repeat(MAX_SCENE_BYTES + 1);
+
+    expect(() => parseJsonBody(text)).toThrow(HttpError);
+    expect(() => parseJsonBody(text)).toThrow("Payload too large");
+  });
+});