Accessibility: Share button not focusable, not useable with keyboard

[tigexplorer]

Platform: Ubuntu 22.04 LTS
Server type: NGINX/Apache2 ...
PHP version: 8.1

The Share Button is not accessible with Tab/ Keyboard.

So blind users may not able to use it.

https://developer.mozilla.org/en-US/docs/Web/Accessibility/Understanding_WCAG/Keyboard#interactive_elements_must_be_focusable