fix: accessibility navigation

[Goketech]

This pr closes issue 1280

It adds ability to access the buttons in the (bottom) navigation, using keyboard.

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commit: ebbbcfe

[Goketech]

@KermanX
@antfu

[KermanX]

Thank you for the PR. Could you also help to outline the navigation button when it is focused by tabbing?

By the way, in my opinion, it is not very good to ping (i.e. @) other people unless it's urgent or they haven't subscribed to this repo 😇

[Goketech]

I have made the requested updates.

I am sorry about the ping.