feat(admin-images) : add standalone export generators

lib/image-generator-draft.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  IMAGE_GENERATOR_DRAFT_VERSION,
+  parseImageGeneratorDraft,
+  serializeImageGeneratorDraft,
+} from "./image-generator-draft";
+
+describe("image generator drafts", () => {
+  const parseTitle = (value: unknown) => {
+    if (!value || typeof value !== "object") return null;
+    const title = (value as { title?: unknown }).title;
+    return typeof title === "string" ? { title } : null;
+  };
+
+  it("round trips a versioned draft", () => {
+    const serialized = serializeImageGeneratorDraft({ title: "Hyperbloom" });
+    expect(parseImageGeneratorDraft(serialized, parseTitle)).toEqual({ title: "Hyperbloom" });
+  });
+
+  it("rejects corrupt, incompatible, and invalid drafts", () => {
+    expect(parseImageGeneratorDraft("not-json", parseTitle)).toBeNull();
+    expect(parseImageGeneratorDraft(JSON.stringify({ version: IMAGE_GENERATOR_DRAFT_VERSION + 1, value: { title: "Old" } }), parseTitle)).toBeNull();
+    expect(parseImageGeneratorDraft(JSON.stringify({ version: IMAGE_GENERATOR_DRAFT_VERSION, value: { title: 42 } }), parseTitle)).toBeNull();
+  });
+});