feat(ui): enhance number guessing game UI for elegance

[atharvnikam38]

Summary

Closes #156

Key Features:

• Game Logic: Generates a random number, provides "Too High/Low" hints, and tracks attempts.
• Elegant UI: A clean, responsive card design with custom styling for buttons, inputs, and feedback messages.
• UX: Includes "Enter" key submission and a "Play Again" flow.

Checklist

• Linked issue (if any)
• Ran locally without console errors
• Focused scope (kept PR small)
• Updated docs or TODO comments if needed

Screenshots

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