fix(privacy): the header gave away what the log was hiding

Screenshot mode anonymises sender names in the message list. The channel header
I added yesterday sat above that list and showed two things it should not.

The home world, on the right. It narrows a player down almost as far as the
character name does, and the mode exists so a picture can be shared.

Worse, the tab name on the left. AutoTellTabsService builds a tell tab's name as
"Player@World", so a tell conversation had the partner's name and world set in
tracked caps directly above a log where every message had been anonymised. The
one place a reader looks first was the one place still naming them.

The name is suppressed only where it actually names someone -- a tab with a tell
target set. General or Trade stay readable, because they identify nobody, and a
self-named tab is the user's own text.

Found by asking what the new surface shows rather than by a test failing. Nothing
here was failing.

HellionChat/Ui/StyleEngine/Widgets/ChannelHeader.cs

@@ -68,7 +68,13 @@ internal static class ChannelHeader
         var icon = Components.Sidebar.ResolveTabIcon(tab);
         var track = TrackRaw * scale;
         var detailTrack = DetailTrackRaw * scale;
-        var showName = mode is ChannelHeaderMode.Full;
+        // Screenshot mode hides the name of a tell tab, because that name IS the
+        // conversation partner: AutoTellTabsService builds it as "Player@World".
+        // Drawing it in tracked caps above a log whose messages are anonymised
+        // would give away in the header exactly what the log is hiding.
+        var namesAPartner = tab.TellTarget?.IsSet() == true;
+        var showName =
+            mode is ChannelHeaderMode.Full && !(Plugin.Config.ScreenshotMode && namesAPartner);
 
         // ToUpperInvariant allocates, so only where the name is actually drawn.
         var name = showName ? tab.Name.ToUpperInvariant() : string.Empty;
@@ -92,7 +98,12 @@ internal static class ChannelHeader
         using ((detail.WhereIsTranslated ? body : meta).Push())
             whereRun = DrawListExtensions.MeasureTrackedText(detail.Where, detailTrack);
 
-        var rest = ChannelHeaderDetailParts.Separator + detail.Clock;
+        // No separator with nothing in front of it -- screenshot mode leaves the
+        // clock standing alone.
+        var rest =
+            detail.Where.Length == 0
+                ? detail.Clock
+                : ChannelHeaderDetailParts.Separator + detail.Clock;
 
         float restRun;
         using (meta.Push())
@@ -102,7 +113,7 @@ internal static class ChannelHeader
         var inset = InsetRaw * scale;
 
         var plan = ChannelHeaderLayout.Plan(
-            mode,
+            showName ? ChannelHeaderMode.Full : ChannelHeaderMode.DetailOnly,
             width - inset * 2f,
             ImGui.GetContentRegionAvail().Y - height - reservedBelow,
             nameRun,
@@ -196,7 +207,8 @@ internal static class ChannelHeader
             world,
             DateTimeOffset.Now,
             Plugin.Config.Use24HourClock,
-            Resources.HellionStrings.ChannelHeader_NotLoggedIn
+            Resources.HellionStrings.ChannelHeader_NotLoggedIn,
+            Plugin.Config.ScreenshotMode
         );
     }
 

HellionChat/Ui/StyleEngine/Widgets/ChannelHeaderDetail.cs

@@ -31,14 +31,21 @@ internal static class ChannelHeaderDetail
         string? world,
         DateTimeOffset now,
         bool use24Hour,
-        string fallback
+        string fallback,
+        bool hideWhere
     )
     {
-        var missing = string.IsNullOrWhiteSpace(world);
         var clock = use24Hour
             ? now.ToString("HH:mm", CultureInfo.InvariantCulture)
             : now.ToString("h:mm tt", CultureInfo.InvariantCulture);
 
+        // Screenshot mode. A home world names the player almost as precisely as
+        // the character name does, and the whole point of that mode is that a
+        // picture can be shared. The clock stays -- it identifies nobody.
+        if (hideWhere)
+            return new ChannelHeaderDetailParts(string.Empty, clock, false);
+
+        var missing = string.IsNullOrWhiteSpace(world);
         return new ChannelHeaderDetailParts(missing ? fallback : world!, clock, missing);
     }
 }

HellionChat/Ui/Windows/WidgetGalleryWindow.cs

@@ -96,7 +96,8 @@ internal sealed class WidgetGalleryWindow : Window
             _headerLoggedOut ? null : "Ravana",
             DateTimeOffset.Now,
             Plugin.Config.Use24HourClock,
-            Resources.HellionStrings.ChannelHeader_NotLoggedIn
+            Resources.HellionStrings.ChannelHeader_NotLoggedIn,
+            Plugin.Config.ScreenshotMode
         );
 
         ChannelHeader.Draw(_headerSample, mode, fonts, detail, 0f);