Ajout bannière affichant le temps de pénalité restant

client/app/(tabs)/challenges.tsx

@@ -1,6 +1,7 @@
+import PenaltyBanner from '@/components/PenalyBanner'
 import { FontAwesome6 } from '@expo/vector-icons'
 import { View } from 'react-native'
-import { Appbar, Button, Card, Surface, Text } from 'react-native-paper'
+import { Appbar, Button, Surface, Text } from 'react-native-paper'
 
 export default function ChallengesScreen() {
   return (
@@ -9,6 +10,7 @@ export default function ChallengesScreen() {
         <Appbar.Content title={"Défis"} />
         <Appbar.Action icon='format-list-bulleted' />
       </Appbar.Header>
+      <PenaltyBanner />
       <Surface elevation={2} style={{ flex: 1, margin: 20, borderRadius: 20 }}>
         <View style={{ padding: 10 }}>
           <Text variant='headlineMedium' style={{ textAlign: 'center' }}>Titre</Text>