fix(LabelGroup): add role and aria-label to hidden items overlay (#7241)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: francinelucca

.changeset/four-carrots-divide.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+fix(LabelGroup): add role and aria-label to hidden items overlay

packages/react/src/LabelGroup/LabelGroup.tsx

@@ -70,6 +70,7 @@ const OverlayToggle: React.FC<
   openOverflowOverlay,
   overlayPaddingPx,
   overlayWidth,
+  totalLength,
 }) =>
   hiddenItemIds.length ? (
     <AnchoredOverlay
@@ -91,6 +92,7 @@ const OverlayToggle: React.FC<
         </Button>
       )}
       focusZoneSettings={{disabled: true}}
+      overlayProps={{role: 'dialog', 'aria-label': `All ${totalLength} labels`, 'aria-modal': true}}
     >
       <div className={classes.OverlayContainer} style={{width: overlayWidth, padding: `${overlayPaddingPx}px`}}>
         <div className={classes.OverlayInner}>{children}</div>