refactor(tender-details): integrate unixToDate for date formatting and enhance layout consistency

- Replaced msToDate with unixToDate for application, publication, submission, and tender deadlines to ensure accurate date representation.
- Improved ShowcaseSection layout by adjusting class names for better visual consistency across various sections.
- Enhanced error message formatting for improved readability.

src/utils/shared.ts

@@ -8,7 +8,7 @@ export const unixToDate = ({
   unix: number;
   hasTime?: boolean;
 }) => {
-  return moment.unix(unix).format(`YYYY/MM/DD - ${hasTime ? "HH:MM" : ""}`);
+  return unix === 0 ? "-" : moment.unix(unix).format(`YYYY/MM/DD - ${hasTime ? "HH:MM" : ""}`);
 };
 export const msToDate = (ms: number) => {
   return moment.default(ms).format("YYYY/MM/DD");