add contact page with working form

[adityasingh-0803]

What to include:

Add a new /contact page with fields: Name, Email, Message.

Add form validation and success/error states.

Use a static form handler (e.g., Formspree / Netlify Forms) if backend unavailable.

Add a small success toast or popup message on submission.

Why: Improves user engagement and allows collaboration inquiries.

[github-actions]

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[github-actions]

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