Give the window its v5b chrome and each session surface its own shell

src/DodoSSH.Client.Shell/ViewModels/LogsViewModel.cs

@@ -114,6 +114,12 @@ internal sealed class ActivityLogRowViewModel(VaultItem<ActivityLogSecret> entry
         _ => "changed",
     };
 
+    /// <summary>── v5b ── Whether the WHAT chip should draw in its "created" colour.</summary>
+    internal bool IsCreated => entry.Secret.Operation is ActivityOperation.Created;
+
+    /// <summary>── v5b ── Whether the WHAT chip should draw in its "deleted" colour.</summary>
+    internal bool IsDeleted => entry.Secret.Operation is ActivityOperation.Deleted;
+
     /// <inheritdoc cref="ConnectionLogRowViewModel.Started" />
     internal string At => entry.Secret.At.ToLocalTime().ToString("g", CultureInfo.CurrentCulture);
 
@@ -192,6 +198,24 @@ internal sealed partial class LogsViewModel : ObservableObject
         : "Nothing here yet. Adding, editing or deleting anything in the keychain is recorded here — the "
             + "names of the fields that changed, never their contents.";
 
+    /// <summary>
+    /// ── v5b ── The mono sentence Logs.dc.html prints beside REFRESH: what one row of the showing log
+    /// actually records.
+    /// </summary>
+    /// <remarks>
+    /// Per section rather than one line for the screen, and drawn from the same fact this type's own header
+    /// remarks already state: an entry is written once, at close, for a connection; and once per write, per
+    /// device, for an activity row. Not <see cref="Status"/> itself — that is a refresh outcome, cleared to
+    /// empty on success — so <see cref="HeaderStatusLine"/> is the one the header actually binds, showing an
+    /// error over this fact when there is one to show.
+    /// </remarks>
+    internal string SectionFact => Section is LogSection.Connections
+        ? "an entry is written once, when a connection closes"
+        : "one row per write, per device";
+
+    /// <summary>What the header's own status line shows: an error, if refreshing just produced one, else the fact.</summary>
+    internal string HeaderStatusLine => Status.Length > 0 ? Status : SectionFact;
+
     /// <summary>Shows one of the two logs.</summary>
     [RelayCommand]
     private void ShowSection(LogSection section) => Section = section;
@@ -296,7 +320,11 @@ internal sealed partial class LogsViewModel : ObservableObject
         OnPropertyChanged(nameof(ShowsConnections));
         OnPropertyChanged(nameof(ShowsActivity));
         OnPropertyChanged(nameof(EmptyMessage));
+        OnPropertyChanged(nameof(SectionFact));
+        OnPropertyChanged(nameof(HeaderStatusLine));
     }
+
+    partial void OnStatusChanged(string value) => OnPropertyChanged(nameof(HeaderStatusLine));
 }
 
 /// <summary>A connection that is open right now.</summary>