fix: reserve 1px below last download for press translation

The shadcn button translates 1px down on :active. With overflow-x-auto
on the downloads strip, the last button's press creates an unwanted
scrollbar (CSS forces overflow-y from visible to auto). last:mb-px on
the download wrapper gives it room to breathe.

Author: jpenilla

src/routes/projects/[project]/version/[version]/Build.svelte

@@ -88,7 +88,7 @@
       {#if build.downloads && build.downloads.length > 0}
         <div class="flex flex-wrap gap-2 overflow-x-auto">
           {#each build.downloads as d (d.name)}
-            <div class="flex items-center gap-1">
+            <div class="flex items-center gap-1 last:mb-px">
               <Button href={d.url} rel="noopener noreferrer" title={d.name} size="sm" variant="outline">
                 <span class="iconify lucide--download"></span>
                 <span class="font-mono">{d.name}</span>