perf(baseline): time full Draw() handler into LastDrawMs field

HellionChat/Plugin.cs

@@ -166,6 +166,15 @@ public sealed class Plugin : IAsyncDalamudPlugin
     // because the tick reads it from a different thread than the writer.
     private volatile bool _isDisposing;
 
+    // v1.9.0 B5: last full Draw() wall-time in ms, written once per frame at
+    // the end of the UiBuilder.Draw handler. Covers the GlobalStyleScope push
+    // and the font push (§7.5 First-Frame-HITCH must include atlas/style
+    // prologue cost), not just WindowSystem.Draw — measuring the inner call
+    // alone would drop the prologue and make the figure non-comparable to the
+    // v1.5.6 baseline. Only accumulated here; the disk write happens in
+    // PerformanceBaselineStep so the hot path stays allocation-free.
+    internal double LastDrawMs;
+
     internal int DeferredSaveFrames = -1;
 
     // Cancels the v1.4.8 FTS5 bulk-insert worker on plugin teardown. The
@@ -1011,6 +1020,15 @@ public sealed class Plugin : IAsyncDalamudPlugin
     }
 
     private void Draw()
+    {
+        // v1.9.0 B5: time the whole handler (style + font prologue included).
+        // Bail before measuring once teardown has begun — a late Draw tick
+        // must not touch ThemeRegistry / FontManager after DisposeAsync.
+        if (_isDisposing)
+            return;
+
+        var drawWatch = Stopwatch.StartNew();
+        try
         {
             // v1.4.8 B2: pick up external edits of the active custom theme JSON
             // without forcing the user to re-click the picker. The disk-stat is
@@ -1055,6 +1073,14 @@ public sealed class Plugin : IAsyncDalamudPlugin
 
             FileDialogManager.Draw();
         }
+        finally
+        {
+            // finally so the early-return frames (loading screen / NG+) record
+            // their (cheap) time too instead of freezing on the last full frame.
+            drawWatch.Stop();
+            LastDrawMs = drawWatch.Elapsed.TotalMilliseconds;
+        }
+    }
 
     internal void SaveConfig()
     {