Show schematic description in schematic info (and scroll)

[EggleEgg]

Implements https://github.com/Anuken/Mindustry/pull/4502

Desktop

https://github.com/user-attachments/assets/033a830a-def2-4680-8005-233ee1d176a6

Android

https://github.com/user-attachments/assets/a2d1d43a-f4c3-4019-8c20-d36f7045200c

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[Kev-Vily]

very convenient