Fix newline handling for tool decision messages

Ensure tool decision messages (allowed/denied) are properly isolated with
newlines before and after the content. The fix adds a trailing newline to
the content when missing, in addition to the existing logic that prepends
a newline if the output doesn't already end with one. This guarantees these
messages appear on their own lines in the chat window.

* Plugin/ai/ChatAIWindow.cpp

**Generated by CodeLite**

Signed-off-by: Eran Ifrah <eran@codelite.org>

Author: eranif

Plugin/ai/ChatAIWindow.cpp

@@ -449,10 +449,14 @@ void ChatAIWindow::OnChatAIOutput(clLLMEvent& event)
         if (event.GetOutputReason().has_value()) {
             if (event.GetOutputReason().value() == assistant::Reason::kToolDenied ||
                 event.GetOutputReason().value() == assistant::Reason::kToolAllowed) {
+                // Make sure these lines are placed on their own line.
                 if (!m_stcOutput->GetText().EndsWith("\n")) {
-                    // Make sure these lines are placed on their own line.
                     content.Prepend("\n");
                 }
+
+                if (!content.EndsWith("\n")) {
+                    content << "\n";
+                }
             }
         }
         AppendOutput(content);