feat: update modal and sighting components for improved layout and timestamp display

src/utils/utils.ts

@@ -5,7 +5,8 @@ export const formatNumberPlate = (plate: string) => {
   return formattedPlate;
 };
 
-export const timeAgo = (timestampmili: number) => {
+export const timeAgo = (timestampmili: number | null) => {
+  if (timestampmili === null) return "unknown";
   const diffMs = Date.now() - new Date(timestampmili).getTime();
   const diffMins = Math.floor(diffMs / 60000);
   if (diffMins < 60) {