Feature/arrow key nav

[abhijeetnardele24-hash]

Description

This PR introduces keyboard navigation to documentation pages, allowing users to navigate to the previous or next page using the ArrowLeft and ArrowRight keys. This brings VitePress closer in parity with other documentation tools like mdbook, improving accessibility and reading efficiency for power users.

Technical Details:

• Added a global keydown event listener in VPDoc.vue.
• Connected the listener directly to the existing usePrevNext() composable to resolve the correct prev and next routing links.
• Added heuristics to ensure the event listener respects user intent and prevents accidental navigations:
  • Navigation is aborted if the user is holding any modifier keys (Alt, Ctrl, Meta, Shift).
  • Navigation is aborted if the user's active focus is within an interactive text element (INPUT, TEXTAREA, SELECT, or elements with contenteditable).
  • Navigation is aborted if the event's default action was already prevented by a child component.

Linked Issues

Resolves #5221