fix low level issues

site/src/lib/format.ts

@@ -12,6 +12,7 @@ export function formatDistance(m: number | null, unit: 'metric' | 'imperial' = '
 
 export function formatDuration(s: number | null): string {
   if (s == null) return '—';
+  s = Math.floor(s);
   const h = Math.floor(s / 3600);
   const m = Math.floor((s % 3600) / 60);
   const sec = s % 60;