Add the select menu when referencing issues

[azro352]

Hi
In the browser version of GitHub, when writing "#" a modal appear with the issues allowing to search into them and select easily the one you want
This is not possible on the app and it would be great to be able to do so

Thanks

ℹ️ Additional Debug Info

GitHub for iOS, Version 1.246.1 (186993319) Device: iPhone SE (2nd generation) (iOS 26.2.1)