Update admin theme/layout and refresh README details.

Align the project baseline with the latest admin interface styling and layout structure while documenting setup and usage updates in README.

apps/web/e2e/content/content-pages.spec.ts

@@ -0,0 +1,25 @@
+import { expect, test } from "@playwright/test";
+import { API_URL, adminLogin } from "../helpers/api";
+
+test.describe("§15.7 scenario 4: Admin content publish", () => {
+  test("admin creates content → publish → visible on /pages/:slug", async ({ page, request }) => {
+    const admin = await adminLogin(request);
+    const headers = { Authorization: `Bearer ${(await admin.json()).access_token}` };
+    const slug = `e2e-page-${Date.now()}`;
+
+    const created = await request.post(`${API_URL}/api/v1/content/pages`, {
+      headers,
+      data: {
+        slug,
+        title: "E2E Published Page",
+        body: "<p>Published by admin</p>",
+        status: "published"
+      }
+    });
+    expect(created.ok()).toBeTruthy();
+
+    await page.goto(`/pages/${slug}`);
+    await expect(page.getByRole("heading", { name: "E2E Published Page" })).toBeVisible();
+    await expect(page.getByText("Published by admin")).toBeVisible();
+  });
+});