Moved all extension methods into extension blocks (#1155)

app/MindWork AI Studio/Tools/FileInfoExtensions.cs

@@ -2,16 +2,19 @@ namespace AIStudio.Tools;
 
 public static class FileInfoExtensions
 {
-    /// <summary>
-    /// Returns the file size in human-readable format.
-    /// </summary>
     /// <param name="fileInfo">The file info object.</param>
-    /// <returns>The file size in human-readable format.</returns>
-    public static string FileSize(this FileInfo fileInfo)
+    extension(FileInfo fileInfo)
     {
-        if (!fileInfo.Exists)
-            return "N/A";
+        /// <summary>
+        /// Returns the file size in human-readable format.
+        /// </summary>
+        /// <returns>The file size in human-readable format.</returns>
+        public string FileSize()
+        {
+            if (!fileInfo.Exists)
+                return "N/A";
 
-        return fileInfo.Length.FileSize();
+            return fileInfo.Length.FileSize();
+        }
     }
 }