fix(web): hide citation measurement items from assistive tech (#40203)

web/app/components/base/chat/chat/citation/__tests__/index.spec.tsx

@@ -96,7 +96,9 @@ describe('Citation', () => {
           ]}
         />,
       )
-      expect(screen.getAllByTestId('citation-measurement-item')).toHaveLength(2)
+      const measurementItems = screen.getAllByTestId('citation-measurement-item')
+      expect(measurementItems).toHaveLength(2)
+      measurementItems.forEach((item) => expect(item).toHaveAttribute('aria-hidden', 'true'))
     })
 
     it('should display the document name inside each measurement item', () => {

web/app/components/base/chat/chat/citation/index.tsx

@@ -86,6 +86,7 @@ const Citation: FC<CitationProps> = ({
         {resources.map((res, index) => (
           <div
             key={res.documentId}
+            aria-hidden
             data-testid="citation-measurement-item"
             className="absolute top-0 left-0 -z-10 mr-1 mb-1 h-7 w-auto max-w-60 pr-2 pl-7 text-xs whitespace-nowrap opacity-0"
             ref={(ele: HTMLDivElement | null) => {