fix(theme): christmas theme should only run on dec 24 and 25

that's how 4chan does it, it makes sense since the theme is distracting especially on desktop

src/lib/snow.ts

@@ -102,5 +102,5 @@ export const shouldShowSnow = (): boolean => {
   const today = new Date();
   const month = today.getMonth();
   const day = today.getDate();
-  return (month === 11 && day >= 24) || (month === 0 && day <= 5);
+  return month === 11 && (day === 24 || day === 25);
 };

src/lib/utils/time-utils.ts

@@ -68,3 +68,10 @@ export const getFormattedTimeAgo = (unixTimestamp: number): string => {
   }
   return t('time_x_years_ago', { count: Math.floor(timeDifference / 31104000) });
 };
+
+export const isChristmas = (): boolean => {
+  const today = new Date();
+  const month = today.getMonth();
+  const day = today.getDate();
+  return month === 11 && (day === 24 || day === 25);
+};