docs(example): add Next.js blog example page with usePosts hook

[ArjunSaluja]

This PR adds a new example page under test-projects/next/pages/blog.tsx that demonstrates how to fetch and render blog posts from WordPress using the usePosts hook.

Fetches 5 latest posts

Displays loading and error states

Provides a minimal Next.js integration example

This helps new developers quickly understand how to connect WordPress content with a Next.js frontend.

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Latest commit: 71bfbb2

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