test : added unit tests for KonamiEasterEgg component - #5

Summary of What Has Been Done

Created components/KonamiEasterEgg.test.tsx with comprehensive unit tests covering:

• No overlay renders before the secret code is entered
• Overlay renders after entering the default "commit" secret code
• Overlay shows the "You Found It!" heading, git commit message, and version footer
• Overlay renders when matrix rain is disabled (charCount=0)
• Overlay renders when confetti is disabled (confettiCount=0)
• Custom secretCode prop works correctly (triggers on custom code)
• Keypresses in INPUT and TEXTAREA elements are ignored (do not trigger the easter egg)
• Keydown event listener is registered on mount and removed on unmount

Mocked framer-motion components (motion.div, AnimatePresence) to prevent animation library dependencies in tests.

Changes Made

• New file: components/KonamiEasterEgg.test.tsx

Impact it Made

Adds first unit test coverage for the KonamiEasterEgg component, ensuring the secret code detection and overlay rendering work correctly.

Closes #8420.

Note: please assign this PR to the tmdeveloper007 account.