Refactor management components to remove loading state: Eliminate unused loading state and related conditional rendering from ChallengeManagement, EventManagement, FeedbackManagement, HouseManagement, and UserManagement components, simplifying the code and improving readability.

components/admin/FeedbackManagement.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState, useEffect } from "react";
+import { useState } from "react";
 import {
   addFeedbackBonusPoints,
   markFeedbackAsRead,
@@ -49,7 +49,6 @@ export default function FeedbackManagement({
 }: FeedbackManagementProps) {
   const [feedbacks, setFeedbacks] = useState<Feedback[]>(initialFeedbacks);
   const [statistics, setStatistics] = useState<EventStatistics[]>(initialStatistics);
-  const [loading, setLoading] = useState(false);
   const [error, setError] = useState("");
   const [selectedEvent, setSelectedEvent] = useState<string | null>(null);
   const [addingPoints, setAddingPoints] = useState<Record<string, boolean>>(
@@ -161,14 +160,6 @@ export default function FeedbackManagement({
     );
   });
 
-  if (loading) {
-    return (
-      <div className="bg-black/60 border border-pixel-gold/30 rounded-lg p-4 sm:p-8">
-        <p className="text-gray-400 text-center text-sm">Chargement...</p>
-      </div>
-    );
-  }
-
   return (
     <div className="space-y-4 sm:space-y-6">
       {/* Statistiques par événement */}