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.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: [],
 }));