[bug] tiny bug behind upload button on safari

see attached

after sharing the screenshot and asking claude to search the codebase here is the response (which is wayyyyy over my head to fix; Claude added the fix in some nginx config i had for something else)

"The upload button's CSS is compiled directly into the Filestash Go binary (via go:embed) — not a file I can patch on disk inside the container. The practical fix is to inject a small CSS override via nginx, using sub_filter to append an override