fix(chat): make Enter send from the multiline composer

src/OpenClaw.Tray.WinUI/Chat/ReactorChatComposer.cs

@@ -407,7 +407,9 @@ Element EffortIconButton()
                 PlaceholderFor(inputs.ConnectionState))
             .AutomationId("ChatComposerInput")
             .AutomationName(PlaceholderFor(inputs.ConnectionState))
-            .OnKeyDown((sender, args) =>
+            // Multiline TextBox consumes Enter before bubbling KeyDown. Handle
+            // composer shortcuts in preview so only Shift+Enter inserts a newline.
+            .OnPreviewKeyDown((sender, args) =>
             {
                 if (slashDisplay.IsVisible)
                 {

tests/OpenClaw.Tray.UITests/ReactorChatLayoutProofTests.cs

@@ -506,6 +506,17 @@ await ui.RunOnUIAsync(() =>
                 Assert.Empty(input.Text);
                 Assert.Empty(session.ViewModel.Draft);
             });
+            // A second Enter must neither send again nor add a newline to the
+            // empty draft, including after the send has re-rendered the input.
+            await PressAsync(global::Windows.System.VirtualKey.Enter);
+            await ui.RunOnUIAsync(() =>
+            {
+                Assert.Single(provider.SentMessages);
+                Assert.Empty(input.Text);
+                Assert.Empty(session.ViewModel.Draft);
+            });
+            if (start == 5 && length == 0)
+                await CaptureAsync(surface, "Composer-keyboard-enter-sent");
         }, interactiveKeyboard: true);
     }