feat(bn-file-input): change default style

[gmq]

Context

• Banano is a component library for use in platanus projects.
• The file input component had a provisional style.

Changes

• The style has been updated, moving the button to the right and making the border slightly lighter.
• At some point the component stopped being able to truncate filenames, overflowing its parent. A fix is added to make flex work with text truncation.
• BnBtn rounded variant is reduced slightly to fit style.

Before:

After:

[gmq]

Cambiar el estilo del File Input para que sea menos horrible

[difernandez]

where did you get this w-0 min-w-full max-w-full idea 😮

[gmq]

Trial and error 😅 This sort of thing can usually be fixed using min-width: 0 but it didn't work in this case.
Flexbox + truncated text gets weird, I think the wrapper is maybe interfering with how it should work. There's probably a better solution but it works for now.