Add ability to copy app version from About section

[neshumov]

Issue Details

In About section AdGuard Mini displays version string (AdGuard Mini x.y.z), but currently there is no way to interact with it:

• text cannot be selected
• version cannot be copied to the clipboard

This is inconvenient when creating GitHub issues, because version number has to be rewritten manually. As a result:

• issue creation takes longer
• there is a higher risk of typos or incorrect version numbers

Proposed solution

Add quick and user-friendly way to copy the app version from About section - Add a Copy icon at the end of the version string.

On icon click:

• full version text (e.g. AdGuard Mini 1.3.2) is automatically copied to clipboard

Alternative solution

No response