fix(features): address Task 3 code review feedback

- Add navItemFactory to navigation (spec §5.1 — was missing)
- Refactor blog/router.test.ts to use articleFactory (eliminate new Date())
- headerFactory uses sequence for logoId (deterministic buildList output)
- Align media/tsconfig.json with other features (jsx + tests/ include)
- Refactor auth/container.test.ts to use userFactory

Reviewer: superpowers:code-reviewer (Task 3 of Plan 7).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/navigation/src/__factories__/header.factory.test.ts

@@ -7,7 +7,7 @@ describe("headerFactory", () => {
   it("returns a Header with stable defaults", () => {
     const h = headerFactory.build();
     expect(h.items).toHaveLength(0);
-    expect(h.logoId).toBeUndefined();
+    expect(h.logoId).toBe("logo-1");
   });
 
   it("applies overrides", () => {
@@ -26,4 +26,11 @@ describe("headerFactory", () => {
     expect(a.items).toHaveLength(1);
     expect(b.items).toHaveLength(0);
   });
+
+  it("logoId reflects sequence for deterministic buildList output", () => {
+    const first = headerFactory.build();
+    const second = headerFactory.build();
+    expect(first.logoId).toBe("logo-1");
+    expect(second.logoId).toBe("logo-2");
+  });
 });

packages/navigation/src/__factories__/header.factory.ts

@@ -1,6 +1,7 @@
 import { defineFactory } from "@repo/core-testing/factory";
 import type { Header } from "../entities/header.js";
 
-export const headerFactory = defineFactory<Header>(() => ({
+export const headerFactory = defineFactory<Header>(({ sequence }) => ({
+  logoId: `logo-${sequence}`,
   items: [],
 }));

packages/navigation/src/__factories__/index.ts

@@ -1 +1,2 @@
 export { headerFactory } from "./header.factory.js";
+export { navItemFactory } from "./nav-item.factory.js";

packages/navigation/src/__factories__/nav-item.factory.test.ts

@@ -0,0 +1,29 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { navItemFactory } from "@/__factories__/nav-item.factory";
+
+describe("navItemFactory", () => {
+  beforeEach(() => navItemFactory.reset());
+
+  it("returns a HeaderItem with stable defaults", () => {
+    const item = navItemFactory.build();
+    expect(item.label).toBe("Item 1");
+    expect(item.href).toBe("/item-1");
+    expect(item.external).toBe(false);
+  });
+
+  it("applies overrides", () => {
+    const item = navItemFactory.build({ label: "Home", href: "/", external: true });
+    expect(item.label).toBe("Home");
+    expect(item.href).toBe("/");
+    expect(item.external).toBe(true);
+  });
+
+  it("increments sequence per build", () => {
+    const a = navItemFactory.build();
+    const b = navItemFactory.build();
+    expect(a.label).toBe("Item 1");
+    expect(b.label).toBe("Item 2");
+    expect(a.href).toBe("/item-1");
+    expect(b.href).toBe("/item-2");
+  });
+});

packages/navigation/src/__factories__/nav-item.factory.ts

@@ -0,0 +1,8 @@
+import { defineFactory } from "@repo/core-testing/factory";
+import type { HeaderItem } from "../entities/header.js";
+
+export const navItemFactory = defineFactory<HeaderItem>(({ sequence }) => ({
+  label: `Item ${sequence}`,
+  href: `/item-${sequence}`,
+  external: false,
+}));