Add open all menu action

Services/LauncherController.cs

@@ -62,7 +62,7 @@ public sealed class LauncherController : IDisposable
             return;
         }
 
-        popup = new LauncherPopup(Config, LaunchItem, ShowSettings);
+        popup = new LauncherPopup(Config, LaunchItem, OpenAllItems, ShowSettings);
         popup.Closed += (_, _) => popup = null;
         popup.ShowNearTaskbar();
     }
@@ -126,22 +126,78 @@ public sealed class LauncherController : IDisposable
 
     private void LaunchItem(LauncherItem item)
     {
+        if (TryLaunchItem(item, out string? error))
+        {
+            popup?.Close();
+            return;
+        }
+
+        if (!string.IsNullOrWhiteSpace(error))
+        {
+            System.Windows.MessageBox.Show(error, "Taskbar Launcher");
+        }
+    }
+
+    private void OpenAllItems(LauncherItem menuItem)
+    {
+        List<string> failures = [];
+        int launchedCount = 0;
+
+        foreach (LauncherItem child in menuItem.Children)
+        {
+            if (child.Type == LauncherItemType.Menu || string.IsNullOrWhiteSpace(child.Target))
+            {
+                continue;
+            }
+
+            if (TryLaunchItem(child, out string? error))
+            {
+                launchedCount++;
+            }
+            else if (!string.IsNullOrWhiteSpace(error))
+            {
+                failures.Add(error);
+            }
+        }
+
+        popup?.Close();
+
+        if (failures.Count > 0)
+        {
+            string message = $"Opened {launchedCount} item(s), but {failures.Count} item(s) failed:\n\n" +
+                string.Join("\n\n", failures.Take(5));
+            System.Windows.MessageBox.Show(message, "Taskbar Launcher");
+        }
+    }
+
+    private static bool TryLaunchItem(LauncherItem item, out string? error)
+    {
+        error = null;
+
         if (item.Type == LauncherItemType.Menu || string.IsNullOrWhiteSpace(item.Target))
         {
-            return;
+            return false;
         }
 
         string target = Environment.ExpandEnvironmentVariables(item.Target);
 
-        ProcessStartInfo startInfo = new()
+        try
         {
-            FileName = target,
-            Arguments = item.Arguments ?? "",
-            UseShellExecute = true,
-            WorkingDirectory = Directory.Exists(target) ? target : ConfigService.AppFolder
-        };
+            ProcessStartInfo startInfo = new()
+            {
+                FileName = target,
+                Arguments = item.Arguments ?? "",
+                UseShellExecute = true,
+                WorkingDirectory = Directory.Exists(target) ? target : ConfigService.AppFolder
+            };
 
-        Process.Start(startInfo);
-        popup?.Close();
+            Process.Start(startInfo);
+            return true;
+        }
+        catch (Exception ex)
+        {
+            error = $"{item.Title}: {ex.Message}";
+            return false;
+        }
     }
 }