fix: mac puc rendering issues

Author: abose

src/styles/Extn-AIChatPanel.less

@@ -475,6 +475,7 @@
     margin-bottom: 3px;
     border-radius: 4px;
     background-color: rgba(255, 255, 255, 0.025);
+    border: 1px solid rgba(255, 255, 255, 0.04);
     border-left: 2px solid var(--tool-color, @project-panel-text-2);
 
     .ai-tool-header {