TASK 4 ship step 5.5: social bar bug fixes + bar on the live output — direction-snap drag (SocialBarSnap.Decide + ClearValue, local Canvas.Top was overriding the binding), fediverse nodeinfo subdomain probing + load-time heal (settable FediverseSoftware), SocialBarRenderer strip blitted above the flash via a re-read FramePump socialBar seam — 155 tests passing, 0 warnings

ViewModels/MainViewModel.cs

@@ -80,6 +80,7 @@ public class MainViewModel : ViewModelBase
     private Webcam? _webcam;
     private string? _webcamError;
     private SocialsConfig? _socials;
+    private VideoFrame? _socialBarFrame;
     private readonly IMicrophoneEnumerator _microphoneEnumerator;
 
     // Live audio capture (TASK 4 ship step 4): desktop/game via WASAPI loopback,
@@ -872,7 +873,8 @@ public class MainViewModel : ViewModelBase
             compositorOptions: BuildCompositorOptions,
             encoderOptions: BuildEncoderOptions,
             encoderFactory: () => new FfmpegEncoder(new FfmpegLocator()),
-            log: message => AppLog.Write(message));
+            log: message => AppLog.Write(message),
+            socialBar: () => (_socialBarFrame, _socials?.BarPosition ?? SocialBarPosition.Bottom));
         _framePump.Failed += OnFramePumpFailed;
 
         LoadLayout();
@@ -966,6 +968,8 @@ public class MainViewModel : ViewModelBase
         ReacquireWebcam();
         ReacquireScreenCaptures();
         _socials = _layoutStore.Socials;
+        RenderSocialBarFrame();
+        HealFediverseSoftwareInBackground();
         OnPropertyChanged(nameof(HasSocials));
         OnPropertyChanged(nameof(SocialBarVisible));
         OnPropertyChanged(nameof(SocialBarDotBrush));
@@ -1902,6 +1906,83 @@ public class MainViewModel : ViewModelBase
 
     // ─── Social bar ───
 
+    /// <summary>
+    /// Resolves a missing nodeinfo software name (mastodon, peertube, ...) for every
+    /// fediverse entry that doesn't have one, so the bar shows the instance's real
+    /// logo instead of the generic fediverse glyph. Best-effort: a failed resolution
+    /// leaves the glyph untouched. Returns handle → software for what was resolved —
+    /// the caller applies + persists (the app hops to the dispatcher; a test applies
+    /// directly).
+    /// </summary>
+    public static async Task<Dictionary<string, string>> HealFediverseSoftwareAsync(
+        SocialsConfig socials,
+        ISocialValidator validator,
+        Action<string>? log = null)
+    {
+        var resolved = new Dictionary<string, string>();
+        if (socials == null || validator == null) return resolved;
+        foreach (var entry in socials.Entries)
+        {
+            if (entry.Service != SocialService.Fediverse
+                || !string.IsNullOrWhiteSpace(entry.FediverseSoftware))
+                continue;
+            if (!SocialServiceIcons.TryParseFediverse(entry.Handle, out _, out var domain))
+                continue;
+            var software = await validator.ResolveFediverseSoftwareAsync(
+                domain, System.Threading.CancellationToken.None);
+            if (string.IsNullOrWhiteSpace(software)) continue;
+            resolved[entry.Handle] = software;
+            log?.Invoke($"Socials heal: {entry.Handle} → {software}");
+        }
+        return resolved;
+    }
+
+    /// <summary>Runs the heal off the UI thread and applies + saves any result.</summary>
+    private void HealFediverseSoftwareInBackground()
+    {
+        var socials = _socials;
+        if (socials == null) return;
+        _ = Task.Run(async () =>
+        {
+            try
+            {
+                var resolved = await HealFediverseSoftwareAsync(
+                    socials, _socialValidator, m => AppLog.Write(m));
+                if (resolved.Count == 0) return;
+                await Application.Current.Dispatcher.InvokeAsync(() =>
+                {
+                    var current = _socials;
+                    if (current == null) return;
+                    var applied = false;
+                    foreach (var entry in current.Entries)
+                    {
+                        if (!resolved.TryGetValue(entry.Handle, out var software)) continue;
+                        if (entry.FediverseSoftware == software) continue;
+                        entry.FediverseSoftware = software;
+                        applied = true;
+                    }
+                    if (applied) NotifySocialsChanged(); // re-renders the bar + saves
+                });
+            }
+            catch (Exception ex)
+            {
+                AppLog.Write($"Socials heal failed: {ex.Message}");
+            }
+        });
+    }
+
+    /// <summary>
+    /// Re-rasterizes the social bar strip the output compositor overlays. UI thread
+    /// only (WPF rendering); the resulting frame is immutable, so the frame pump may
+    /// read it from its own thread. Null when the bar is off or empty.
+    /// </summary>
+    private void RenderSocialBarFrame()
+    {
+        _socialBarFrame = _socials != null && _socials.BarEnabled
+            ? SocialBarRenderer.Render(_socials.Entries)
+            : null;
+    }
+
     /// <summary>
     /// Opens the Social Media Site Promotion dialog (6 slots, sign-in gate,
     /// validation). On save the working copy replaces <see cref="_socials"/>.
@@ -1925,6 +2006,7 @@ public class MainViewModel : ViewModelBase
 
     private void NotifySocialsChanged()
     {
+        RenderSocialBarFrame();
         OnPropertyChanged(nameof(HasSocials));
         OnPropertyChanged(nameof(SocialBarVisible));
         OnPropertyChanged(nameof(SocialBarDotBrush));