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");
+  });
 });