Update platform detection

[ibretsam]

Navigator.platform is deprecated. We can use Navigator.userAgentData or Navigator.userAgent to get the platform data.

But since userAgentData is not supported on some browsers, I suggest we should use userAgent instead.

For example, the userAgent value for some browser on MacOS looks like this:

// Chrome
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36'

// Safari
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15" = $1

// Firefox
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0" 

Limitations:
While userAgent isn't exactly used for OS detection like platform, it's acceptable in this scenario since most modern browsers include the operating system information in the userAgent string.

[tuanchauict]

This is not good for maintenance. For example, when we add new supported key, we have to list the key twice.

One option is changing getCommandByKey to accept the key value.

The other is combine key and keyCode into the same record

{
    key: 'Escape',
    code: 27
}

[tuanchauict]

Btw, this PR is for Update platform detection, not for updating the keyCode. Please drop 62f6d72