Add device detection and PDF generation features; refactor AuthDialog and update print utilities

src/FrontOffice.Main/Utilities/Pdf/HtmlToPdfService.cs

@@ -0,0 +1,36 @@
+using PdfSharpCore.Pdf;
+//using HtmlRendererCore.PdfSharpCore;
+
+namespace FrontOffice.Main.Utilities.Pdf;
+
+public interface IHtmlToPdfService
+{
+    byte[] GeneratePdf(string html, string? fileName = null);
+}
+
+public class HtmlToPdfService : IHtmlToPdfService
+{
+    public byte[] GeneratePdf(string html, string? fileName = null)
+    {
+        if (string.IsNullOrWhiteSpace(html))
+            throw new ArgumentException("Html content is empty", nameof(html));
+
+        if (!html.Contains("<html", StringComparison.OrdinalIgnoreCase))
+        {
+            html = $"<html><head><meta charset='utf-8'><style>{GetDefaultStyles()}</style></head><body>{html}</body></html>";
+        }
+        else if (!html.Contains("<style", StringComparison.OrdinalIgnoreCase))
+        {
+            // Inject default styles if none provided
+            html = html.Replace("<head>", "<head><style>" + GetDefaultStyles() + "</style>");
+        }
+
+        using var document = new PdfDocument();
+        //PdfGenerator.AddPdfPages(document, html, PdfSharpCore.PageSize.A4);
+        using var ms = new MemoryStream();
+        document.Save(ms);
+        return ms.ToArray();
+    }
+
+    private static string GetDefaultStyles() => @"body{font-family:'Vazir','Arial';direction:rtl;text-align:right;font-size:12px;line-height:1.6;margin:25px;} h1,h2,h3{margin:0 0 12px;} ul{margin:0 0 12px 0;padding:0 18px;} .small{font-size:10px;color:#555;}";
+}