Add admin challenge acceptance functionality: Implement adminAcceptChallenge method in ChallengeService, allowing admins to accept pending challenges. Update ChallengeManagement component to include a button for accepting challenges, enhancing admin capabilities and user feedback handling.

components/admin/ChallengeManagement.tsx

@@ -8,6 +8,7 @@ import {
   deleteChallenge,
   adminCancelChallenge,
   reactivateChallenge,
+  adminAcceptChallenge,
 } from "@/actions/admin/challenges";
 import {
   Button,
@@ -226,6 +227,29 @@ export default function ChallengeManagement() {
     });
   };
 
+  const handleAdminAccept = async (challengeId: string) => {
+    if (
+      !confirm(
+        "Êtes-vous sûr de vouloir accepter ce défi à la place de l'utilisateur ?"
+      )
+    ) {
+      return;
+    }
+
+    startTransition(async () => {
+      const result = await adminAcceptChallenge(challengeId);
+
+      if (result.success) {
+        setSuccessMessage("Défi accepté avec succès");
+        fetchChallenges();
+        setTimeout(() => setSuccessMessage(null), 5000);
+      } else {
+        setErrorMessage(result.error || "Erreur lors de l'acceptation");
+        setTimeout(() => setErrorMessage(null), 5000);
+      }
+    });
+  };
+
   if (loading) {
     return (
       <div className="text-center text-pixel-gold py-8">Chargement...</div>
@@ -376,6 +400,16 @@ export default function ChallengeManagement() {
               >
                 Modifier
               </Button>
+              {challenge.status === "PENDING" && (
+                <Button
+                  onClick={() => handleAdminAccept(challenge.id)}
+                  variant="primary"
+                  size="sm"
+                  disabled={isPending}
+                >
+                  Accepter le défi
+                </Button>
+              )}
               {challenge.status === "ACCEPTED" && (
                 <Button
                   onClick={() => setSelectedChallenge(challenge)}