fix: resolve test failures from timezone conversion and interface rename

- Fix CriteriaSheetGenerator.FormatTimestamp to handle all DateTimeKind values
- Update TestWebApplicationFactory to use IAuthenticationService
- Add logger parameter to ExcelParserServiceTests
- Add SecureStoreManager to solution under /utils/ folder

NEW/src/JdeScoping.ExcelIO/Generators/CriteriaSheetGenerator.cs

@@ -176,8 +176,17 @@ public class CriteriaSheetGenerator
         }
 
         var options = _options.Value;
-        var timezone = TimeZoneInfo.FindSystemTimeZoneById(options.TimezoneId);
-        var localTime = TimeZoneInfo.ConvertTimeFromUtc(dateTime.Value, timezone);
+        var targetTimezone = TimeZoneInfo.FindSystemTimeZoneById(options.TimezoneId);
+        var dt = dateTime.Value;
+
+        // Convert to target timezone based on the source DateTime's Kind
+        var localTime = dt.Kind switch
+        {
+            DateTimeKind.Utc => TimeZoneInfo.ConvertTimeFromUtc(dt, targetTimezone),
+            DateTimeKind.Local => TimeZoneInfo.ConvertTime(dt, TimeZoneInfo.Local, targetTimezone),
+            // Unspecified - database values are stored in target timezone, no conversion needed
+            _ => dt
+        };
 
         return $"{localTime:MMM dd, yyyy hh:mm:ss tt} {options.TimezoneAbbreviation}";
     }