Show filter or assembly name in live display panel header

When a filter is provided, displays it in the header like:
╭─filter "Method=RegExp" (123/456)───
Otherwise shows the assembly name.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: rogeralsing

src/Asynkron.TestRunner/LiveDisplay.cs

@@ -24,12 +24,24 @@ public class LiveDisplay
     private readonly HashSet<string> _running = new();
     private string? _lastCompleted;
     private string? _lastStatus;
+    private string? _filter;
+    private string? _assemblyName;
 
     public void SetTotal(int total)
     {
         lock (_lock) _total = total;
     }
 
+    public void SetFilter(string? filter)
+    {
+        lock (_lock) _filter = filter;
+    }
+
+    public void SetAssembly(string assemblyPath)
+    {
+        lock (_lock) _assemblyName = Path.GetFileNameWithoutExtension(assemblyPath);
+    }
+
     public void TestStarted(string displayName)
     {
         lock (_lock) _running.Add(Truncate(displayName, ContentWidth));
@@ -132,8 +144,13 @@ public IRenderable Render()
                 CreateRunningSection()
             );
 
+            // Build header: show filter if set, otherwise assembly name
+            var headerText = !string.IsNullOrEmpty(_filter)
+                ? $"[dim]filter[/] [bold]\"{_filter}\"[/]"
+                : _assemblyName ?? "Test Progress";
+
             var panel = new Panel(layout)
-                .Header($"[bold]Test Progress[/] [dim]({completed}/{_total})[/]")
+                .Header($"{headerText} [dim]({completed}/{_total})[/]")
                 .Border(BoxBorder.Rounded)
                 .BorderColor(Color.Grey)
                 .Expand();

src/Asynkron.TestRunner/TestRunner.cs

@@ -101,6 +101,8 @@ private async Task RunWithRecoveryLiveAsync(string assemblyPath, List<string> al
 
         var display = new LiveDisplay();
         display.SetTotal(allTests.Count);
+        display.SetFilter(_filter);
+        display.SetAssembly(assemblyPath);
 
         var failureDetails = new List<(string Name, string Message, string? Stack)>();