UI: Make error fallback data uniform with N/A for all fields

src/app/services/world-bank.ts

@@ -42,9 +42,9 @@ export class WorldBankService {
       catchError(error => {
         console.error(`Failed to fetch data for ${countryCode}:`, error);
         return of({
-          name: `Country Code: ${countryCode}`,
-          capital: 'Data not available',
-          region: 'Not available in World Bank API',
+          name: 'N/A',
+          capital: 'N/A',
+          region: 'N/A',
           incomeLevel: 'N/A',
           longitude: 'N/A',
           latitude: 'N/A'