feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

src/Paca.App/QrCodeDialog.xaml.cs

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+using System;
+using System.IO;
+using System.Windows;
+using System.Windows.Media.Imaging;
+using QRCoder;
+
+namespace Paca.App;
+
+public partial class QrCodeDialog : Window
+{
+    public string PageUrl { get; }
+    public string PageTitle { get; }
+
+    public QrCodeDialog(string url, string title)
+    {
+        InitializeComponent();
+        PageUrl = url;
+        PageTitle = title;
+
+        PageTitleText.Text = string.IsNullOrWhiteSpace(title) ? url : title;
+        UrlDisplayBox.Text = url;
+
+        GenerateQrImage(url);
+    }
+
+    private void GenerateQrImage(string url)
+    {
+        try
+        {
+            using var generator = new QRCodeGenerator();
+            using var data = generator.CreateQrCode(string.IsNullOrWhiteSpace(url) ? " " : url, QRCodeGenerator.ECCLevel.M);
+            var qr = new QRCode(data);
+            using var bmp = qr.GetGraphic(8);
+            using var ms = new MemoryStream();
+            bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
+            ms.Position = 0;
+            var frame = BitmapFrame.Create(ms, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
+            frame.Freeze();
+            QrImage.Source = frame;
+        }
+        catch { }
+    }
+
+    private void CopyUrlBtn_Click(object sender, RoutedEventArgs e)
+    {
+        try
+        {
+            Clipboard.SetText(PageUrl);
+            CopyUrlBtn.Content = "복사됨 ✓";
+        }
+        catch { }
+    }
+
+    private void DoneBtn_Click(object sender, RoutedEventArgs e)
+    {
+        Close();
+    }
+}