Edit Signature window: usability improvements to Type dropdown

[Jambeeno]

1. Adding the size (XL, L, M, or S) to the parenthetical mass descriptions would be very handy for old-schoolers. So e.g. this would instead read:

   1. M164: LS→Thera (VL, 1000 kt)

2. Lighter text colors like the green of HS and orange of LS are hard to read. A darker background would be nice.

3. The dropdown scrolls super-quickly and there’s a tiny vertical sliver of space which triggers the scrolling. Making it expand to fit all suggestions would be an improvement (or simply 2x the height). If height can’t be adjusted, slower scrolling & bigger scroll-triggering zones would be nice.

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[Astriania]

This is really multiple issues, some parts are easy and some are not