fix: add 404 Not Found page for invalid routes

[kunwarshivamjsr]

🐛 Fix: Add 404 Not Found Page for Invalid Routes

Closes #497

Problem

Visiting any invalid URL (e.g. /anythingrandom) showed a completely blank page with only the navbar visible. No error message or navigation guidance was provided to the user.

Solution

• Created a new NotFound.js component in client/src/pages/
• Added a catch-all route path="*" in App.js to render the 404 page
• The page includes a clear message and a "Go Back Home" button

Screenshots

Type of Change

• Bug fix

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