[test]: useKeyboard

[forckes]

In useKeyboard hook useRefState(window) called unconditionally crashing on SSR since window is undefined. So i added initial value
Also added UseKeyboardReturn type for tests.

Tests:
Added useKeyboard.test.ts that checks all 6 target variants and verifies:

• the hook return value (on client and on server)
• that the callback runs on keydown
• that onKeyDown option works
• that onKeyUp option works
• that both onKeyDown and onKeyUp work together
• that event listeners are removed on unmount
• that the correct keyboard key is passed to the callback
• that the listener attaches to window when no target is provided
• that updated options work after rerender

Fixes #373

[forckes]

i dont know why bundle file was added here