Added user photo resizing

src/Helpers/ImageHelper.cs

@@ -0,0 +1,42 @@
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Processing;
+using SixLabors.ImageSharp.Formats.Jpeg;
+using System.IO;
+using SixLabors.ImageSharp.Formats.Gif;
+using SixLabors.ImageSharp.Processing.Processors.Quantization;
+using SixLabors.ImageSharp.Formats.Png;
+using SixLabors.ImageSharp.Formats.Webp;
+
+namespace Berufsschule_HAM.Helpers;
+
+public static class ImageHelper
+{
+    public static string ResizeAndConvertToBase64(byte[] imageBytes, int size = 32)
+    {
+        size = Math.Min(size, 256);
+        using var inputStream = new MemoryStream(imageBytes);
+        using var image = Image.Load(inputStream);
+
+        // Optional: crop to square before resize
+        int minDimension = Math.Min(image.Width, image.Height);
+        var cropRectangle = new Rectangle(
+            (image.Width - minDimension) / 2,
+            (image.Height - minDimension) / 2,
+            minDimension,
+            minDimension);
+
+        image.Mutate(x =>
+        {
+            x.Crop(cropRectangle);
+            x.Resize(new ResizeOptions
+            {
+                Size = new Size(size, size),
+                Mode = ResizeMode.Crop
+            });
+        });
+
+        using var outputStream = new MemoryStream();
+        image.Save(outputStream, new WebpEncoder(){});
+        return Convert.ToBase64String(outputStream.ToArray());
+    }
+}