Add inactivity safeguard and speaker diagnostics

MeetingAssistant.Tests/TaskbarIconTests.cs

@@ -1,6 +1,8 @@
 using MeetingAssistant.LaunchProfiles;
 using MeetingAssistant.Recording;
 using MeetingAssistant.Taskbar;
+using System.Drawing;
+using System.Runtime.Versioning;
 
 namespace MeetingAssistant.Tests;
 
@@ -81,6 +83,29 @@ public sealed class TaskbarIconTests
         Assert.Equal(RecordingProcessState.Recording, menu.State);
     }
 
+    [Fact]
+    [SupportedOSPlatform("windows")]
+    public void TaskbarIconGlyphsAreVisuallyCentered()
+    {
+        foreach (var state in new[]
+        {
+            RecordingProcessState.Idle,
+            RecordingProcessState.Recording,
+            RecordingProcessState.Summarizing
+        })
+        {
+            using var bitmap = TaskbarIconRenderer.RenderBitmap(state);
+            var bounds = GetVisibleGlyphBounds(bitmap);
+
+            Assert.True(
+                IsCentered(GetCenter(bounds.Left, bounds.Right)),
+                $"{state} glyph is horizontally off-center: {bounds}");
+            Assert.True(
+                IsCentered(GetCenter(bounds.Top, bounds.Bottom)),
+                $"{state} glyph is vertically off-center: {bounds}");
+        }
+    }
+
     private static LaunchProfile Profile(string name, string hotkey = "")
     {
         return new LaunchProfile(name, new MeetingAssistantOptions
@@ -106,4 +131,42 @@ public sealed class TaskbarIconTests
             state,
             profile);
     }
+
+    [SupportedOSPlatform("windows")]
+    private static Rectangle GetVisibleGlyphBounds(Bitmap bitmap)
+    {
+        var left = bitmap.Width;
+        var top = bitmap.Height;
+        var right = -1;
+        var bottom = -1;
+        for (var y = 0; y < bitmap.Height; y++)
+        {
+            for (var x = 0; x < bitmap.Width; x++)
+            {
+                var pixel = bitmap.GetPixel(x, y);
+                if (pixel.A < 32 || pixel.GetBrightness() < 0.58f)
+                {
+                    continue;
+                }
+
+                left = Math.Min(left, x);
+                top = Math.Min(top, y);
+                right = Math.Max(right, x);
+                bottom = Math.Max(bottom, y);
+            }
+        }
+
+        Assert.True(right >= left && bottom >= top, "Expected the icon to contain a visible white glyph.");
+        return Rectangle.FromLTRB(left, top, right, bottom);
+    }
+
+    private static double GetCenter(int start, int end)
+    {
+        return (start + end) / 2.0;
+    }
+
+    private static bool IsCentered(double center)
+    {
+        return center is >= 7.25 and <= 8.75;
+    }
 }