🩹(frontend) allow fullscreen share warning interaction in PiP

Enable PiP fullscreen share warning buttons; drop `inert` from StageFrame

src/frontend/src/features/pip/components/layout/StageFrame.tsx

@@ -1,12 +1,19 @@
 import { useTranslation } from 'react-i18next'
 import { styled } from '@/styled-system/jsx'
+import { useLocalParticipant } from '@livekit/components-react'
 
 export const StageFrame = ({ children }: { children: React.ReactNode }) => {
   const { t } = useTranslation('rooms', {
     keyPrefix: 'pictureInPicture',
   })
+  const { localParticipant } = useLocalParticipant()
+
   return (
-    <Container role="region" aria-label={t('stage')} {...{ inert: '' }}>
+    <Container
+      role="region"
+      aria-label={t('stage')}
+      {...(!localParticipant.isScreenShareEnabled ? { inert: '' } : {})}
+    >
       {children}
     </Container>
   )