fix: code block text color in AI panel for light theme

Add explicit color to inline code elements using panel text
color. The sidebar is always dark regardless of editor theme,
so code blocks need to use panel text colors not body text.

Author: abose

src/styles/Extn-AIChatPanel.less

@@ -439,6 +439,7 @@
 
         code {
             background-color: rgba(255, 255, 255, 0.08);
+            color: @project-panel-text-1;
             padding: 1px 4px;
             border-radius: 3px;
             font-size: @sidebar-small-font-size;