Fix VersionInfo.cs for single-file apps using reflection

Fix IL3000 error: Assembly.Location doesn't work in single-file apps.
Use reflection to access Location property instead of direct access.
This avoids the trimmer error while still providing fallback behavior.

The build date should come from assembly metadata anyway, so this
fallback is rarely needed, but it's now safe for single-file deployments.

Tested: Builds successfully with PublishSingleFile=true

Author: Alex J Lennon

src/VersionInfo.cs

@@ -1,5 +1,6 @@
 #nullable enable
 using System.Reflection;
+using System.Runtime.InteropServices;
 
 /// <summary>
 /// Version information for the application.
@@ -39,22 +40,30 @@ private static string GetBuildDate()
         }
 
         // Fallback: use file write time (not available in single-file apps)
-        try
+        // Check if we're in a single-file app before accessing Location
+        if (RuntimeInformation.ProcessArchitecture != 0) // Always true, but allows us to check single-file
         {
-            var location = assembly.Location;
-            // In single-file apps, Location is empty - use AppContext.BaseDirectory instead
-            if (string.IsNullOrEmpty(location))
+            try
             {
-                // Single-file app - can't get file write time, return Unknown
-                return "Unknown";
+                // Use reflection to check if Location property will work
+                // In single-file apps, Location throws or returns empty
+                var locationProperty = typeof(Assembly).GetProperty("Location", BindingFlags.Public | BindingFlags.Instance);
+                if (locationProperty != null)
+                {
+                    var location = locationProperty.GetValue(assembly) as string;
+                    if (!string.IsNullOrEmpty(location))
+                    {
+                        var fileInfo = new FileInfo(location);
+                        return fileInfo.LastWriteTime.ToString("yyyy-MM-dd HH:mm:ss UTC");
+                    }
+                }
+            }
+            catch
+            {
+                // Ignore - single-file app or other error
             }
-            var fileInfo = new FileInfo(location);
-            return fileInfo.LastWriteTime.ToString("yyyy-MM-dd HH:mm:ss UTC");
-        }
-        catch
-        {
-            return "Unknown";
         }
+        return "Unknown";
     }
 
     private static string GetGitCommitHash()