Fix name column fading issue in LibrarySampleGrid

Commit notes

Replace custom mask-based fade effect (.sample-name-fade) with Tailwind's truncate utility. The mask was applying a gradient fade unconditionally, even on short names that don't overflow. The truncate class only shows ellipsis when text actually overflows, which is the expected behavior.

Co-authored-by: armin.naimi <[email redacted]>