Add custom app icon: contact silhouette with sync arrows

Generated programmatically, no external ICO file needed.
Blue rounded square with white person silhouette and green/yellow
sync arrows. Used for main window title bar and system tray.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/StarfaceOutlookSync/UI/AppIcon.cs

@@ -0,0 +1,108 @@
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+
+namespace StarfaceOutlookSync.UI
+{
+    /// <summary>
+    /// Generiert das App-Icon programmatisch (Kontakt-Symbol mit Sync-Pfeilen).
+    /// Kein externes ICO-File noetig.
+    /// </summary>
+    public static class AppIcon
+    {
+        private static Icon _icon;
+
+        public static Icon GetIcon()
+        {
+            if (_icon != null) return _icon;
+            _icon = CreateIcon(32);
+            return _icon;
+        }
+
+        public static Icon GetSmallIcon()
+        {
+            return CreateIcon(16);
+        }
+
+        private static Icon CreateIcon(int size)
+        {
+            using (var bmp = new Bitmap(size, size))
+            using (var g = Graphics.FromImage(bmp))
+            {
+                g.SmoothingMode = SmoothingMode.AntiAlias;
+                g.Clear(Color.Transparent);
+
+                if (size >= 32)
+                    DrawIcon32(g);
+                else
+                    DrawIcon16(g);
+
+                return Icon.FromHandle(bmp.GetHicon());
+            }
+        }
+
+        private static void DrawIcon32(Graphics g)
+        {
+            // Hintergrund: abgerundetes Quadrat
+            using (var bgBrush = new SolidBrush(Color.FromArgb(0, 120, 212)))
+            {
+                FillRoundedRect(g, bgBrush, 0, 0, 31, 31, 6);
+            }
+
+            // Person (Kopf)
+            using (var whiteBrush = new SolidBrush(Color.White))
+            {
+                g.FillEllipse(whiteBrush, 11, 4, 10, 10);
+                // Person (Koerper)
+                g.FillPie(whiteBrush, 6, 14, 20, 18, 180, 180);
+            }
+
+            // Sync-Pfeile unten rechts
+            using (var arrowPen = new Pen(Color.FromArgb(120, 255, 120), 2f))
+            {
+                arrowPen.StartCap = LineCap.Round;
+                arrowPen.EndCap = LineCap.ArrowAnchor;
+                // Pfeil rechts
+                g.DrawArc(arrowPen, 20, 22, 10, 8, 200, 140);
+                arrowPen.Color = Color.FromArgb(255, 200, 80);
+                // Pfeil links
+                g.DrawArc(arrowPen, 20, 22, 10, 8, 20, 140);
+            }
+        }
+
+        private static void DrawIcon16(Graphics g)
+        {
+            // Hintergrund
+            using (var bgBrush = new SolidBrush(Color.FromArgb(0, 120, 212)))
+            {
+                FillRoundedRect(g, bgBrush, 0, 0, 15, 15, 3);
+            }
+
+            // Person (vereinfacht)
+            using (var whiteBrush = new SolidBrush(Color.White))
+            {
+                g.FillEllipse(whiteBrush, 4, 1, 7, 7);
+                g.FillPie(whiteBrush, 2, 8, 12, 10, 180, 180);
+            }
+
+            // Kleiner Sync-Indikator
+            using (var dotBrush = new SolidBrush(Color.FromArgb(120, 255, 120)))
+            {
+                g.FillEllipse(dotBrush, 11, 11, 4, 4);
+            }
+        }
+
+        private static void FillRoundedRect(Graphics g, Brush brush, int x, int y, int w, int h, int r)
+        {
+            using (var path = new GraphicsPath())
+            {
+                path.AddArc(x, y, r * 2, r * 2, 180, 90);
+                path.AddArc(x + w - r * 2, y, r * 2, r * 2, 270, 90);
+                path.AddArc(x + w - r * 2, y + h - r * 2, r * 2, r * 2, 0, 90);
+                path.AddArc(x, y + h - r * 2, r * 2, r * 2, 90, 90);
+                path.CloseFigure();
+                g.FillPath(brush, path);
+            }
+        }
+    }
+}

src/StarfaceOutlookSync/UI/MainForm.cs

@@ -62,6 +62,7 @@ namespace StarfaceOutlookSync.UI
             MinimumSize = new Size(500, 350);
             StartPosition = FormStartPosition.CenterScreen;
             Font = new Font("Segoe UI", 9);
+            Icon = AppIcon.GetIcon();
 
             // Profil-Liste
             _profileList = new ListView
@@ -128,7 +129,7 @@ namespace StarfaceOutlookSync.UI
             _trayIcon = new NotifyIcon
             {
                 Text = "Starface Kontakt-Sync",
-                Icon = SystemIcons.Application,
+                Icon = AppIcon.GetSmallIcon(),
                 ContextMenuStrip = _trayMenu,
                 Visible = true
             };