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

src/FrontOffice.Main/Utilities/DeviceDetector.cs

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+using System;
+using System.Globalization;
+using Microsoft.AspNetCore.Http;
+
+namespace FrontOffice.Main.Utilities;
+
+public interface IDeviceDetector
+{
+    DeviceInfo Detect(string? userAgent = null);
+    bool IsMobile(string? userAgent = null);
+    bool IsTablet(string? userAgent = null);
+    bool IsDesktop(string? userAgent = null);
+}
+
+public sealed class DeviceDetector : IDeviceDetector
+{
+    private readonly IHttpContextAccessor _httpContextAccessor;
+
+    public DeviceDetector(IHttpContextAccessor httpContextAccessor)
+    {
+        _httpContextAccessor = httpContextAccessor ?? throw new ArgumentNullException(nameof(httpContextAccessor));
+    }
+
+    public DeviceInfo Detect(string? userAgent = null)
+    {
+        string? headerUa = null;
+        var http = _httpContextAccessor.HttpContext;
+        if (http != null)
+        {
+            headerUa = http.Request.Headers["User-Agent"].ToString();
+        }
+
+        var ua = userAgent ?? headerUa ?? string.Empty;
+        var uaLower = ua.ToLower(CultureInfo.InvariantCulture);
+
+        // Bots
+        if (ContainsAny(uaLower, "bot", "spider", "crawler", "bingpreview", "facebookexternalhit"))
+        {
+            return new DeviceInfo(DeviceType.Bot, DetectOs(uaLower), DetectBrowser(uaLower), ua);
+        }
+
+        var type = DetectDeviceType(uaLower);
+        var os = DetectOs(uaLower);
+        var browser = DetectBrowser(uaLower);
+
+        return new DeviceInfo(type, os, browser, ua);
+    }
+
+    public bool IsMobile(string? userAgent = null) => Detect(userAgent).Type == DeviceType.Mobile;
+    public bool IsTablet(string? userAgent = null) => Detect(userAgent).Type == DeviceType.Tablet;
+    public bool IsDesktop(string? userAgent = null) => Detect(userAgent).Type == DeviceType.Desktop;
+
+    private static DeviceType DetectDeviceType(string uaLower)
+    {
+        if (string.IsNullOrWhiteSpace(uaLower)) return DeviceType.Unknown;
+
+        // Tablets
+        if (ContainsAny(uaLower, "ipad", "tablet", "kindle", "silk", "playbook"))
+            return DeviceType.Tablet;
+
+        // Mobiles (exclude tablets when possible)
+        if (ContainsAny(uaLower, "mobi", "iphone", "ipod", "android") && !uaLower.Contains("tablet"))
+            return DeviceType.Mobile;
+
+        // Smart TV
+        if (ContainsAny(uaLower, "smart-tv", "smarttv", "hbbtv", "appletv"))
+            return DeviceType.Desktop; // treat TVs as desktop-like
+
+        return DeviceType.Desktop;
+    }
+
+    private static string DetectOs(string uaLower)
+    {
+        if (string.IsNullOrWhiteSpace(uaLower)) return "Unknown";
+        if (uaLower.Contains("windows nt")) return "Windows";
+        if (uaLower.Contains("android")) return "Android";
+        if (uaLower.Contains("iphone") || uaLower.Contains("ipad") || uaLower.Contains("ipod") || uaLower.Contains("ios")) return "iOS";
+        if (uaLower.Contains("mac os x") || uaLower.Contains("macintosh")) return "macOS";
+        if (uaLower.Contains("linux")) return "Linux";
+        if (uaLower.Contains("cros")) return "ChromeOS";
+        return "Unknown";
+    }
+
+    private static string DetectBrowser(string uaLower)
+    {
+        if (string.IsNullOrWhiteSpace(uaLower)) return "Unknown";
+        if (uaLower.Contains("edg/")) return "Edge"; // Chromium Edge
+        if (uaLower.Contains("edge/")) return "Edge"; // Legacy Edge
+        if (uaLower.Contains("opr/") || uaLower.Contains("opera")) return "Opera";
+        if (uaLower.Contains("chrome/") && !uaLower.Contains("edg/") && !uaLower.Contains("opr/") && !uaLower.Contains("chromium")) return "Chrome";
+        if (uaLower.Contains("safari") && !uaLower.Contains("chrome")) return "Safari";
+        if (uaLower.Contains("firefox")) return "Firefox";
+        if (uaLower.Contains("msie") || uaLower.Contains("trident/")) return "IE";
+        if (uaLower.Contains("chromium")) return "Chromium";
+        return "Unknown";
+    }
+
+    private static bool ContainsAny(string source, params string[] values)
+    {
+        foreach (var v in values)
+        {
+            if (source.Contains(v)) return true;
+        }
+        return false;
+    }
+}
+
+public enum DeviceType
+{
+    Unknown = 0,
+    Mobile = 1,
+    Tablet = 2,
+    Desktop = 3,
+    Bot = 4
+}
+
+public sealed record DeviceInfo(DeviceType Type, string Os, string Browser, string UserAgent);