fix the front page history incorrectly claiming yesterday is today for most of the day.

frontend/src/lib/utils/date.ts

@@ -56,12 +56,12 @@ export function formatWeekdayTitle(now: Date, time: Date | string | number): str
     time = new Date(time);
   }
 
-  const diff = Math.round((time.getTime() - now.getTime()) / (86400000));
-  if (diff === -1) {
+  const diff = Math.floor((time.getTime() - now.getTime()) / (86400000));
+  if (diff === 0) {
     return "Today"
-  } else if (diff === -2) {
+  } else if (diff === -1) {
     return "Yesterday"
-  } else if (diff >= -7) {
+  } else if (diff >= -6) {
     return `${weekDay[time.getDay()]}`;
   } else {
     return formatWeekdayDate(time);