refactor(assistant): Replace hardcoded color with Fluent UI token for protected message (#8713)

Update protected message color

Author: ccastrotrejo

libs/chatbot/src/lib/ui/styles.ts

@@ -146,7 +146,7 @@ export const useChatbotStyles = makeStyles({
     fontSize: '10.5px',
     display: 'flex',
     fontWeight: tokens.fontWeightBold,
-    color: '#489d42', // Keep original green
+    color: tokens.colorPaletteGreenBorderActive,
     lineHeight: '12px',
   },