refactor(frontend): replace confirm() with modern confirmation modals

Replaced all confirm() dialogs with reusable ConfirmationModal component
for better UX. Modal dialogs provide clearer context, visual consistency,
and prevent accidental confirmations.

Changes:
- MatchesPage: Reject match request confirmation modal
- DashboardPage: Decline and cancel request confirmation modals
- ContactMessagesPage: Delete message confirmation modal

All modals support loading states during async operations and provide
clear action descriptions with destructive action styling.

frontend/src/pages/DashboardPage.jsx

@@ -7,6 +7,7 @@ import { dashboardAPI, matchesAPI } from '../services/api';
 import { connectSocket, disconnectSocket, getSocket } from '../services/socket';
 import { DashboardSkeleton } from '../components/common/Skeleton';
 import EmptyState from '../components/common/EmptyState';
+import ConfirmationModal from '../components/modals/ConfirmationModal';
 import {
   DashboardEventCard,
   DashboardMatchCard,
@@ -28,6 +29,9 @@ const DashboardPage = () => {
   const { user } = useAuth();
   const [data, setData] = useState(null);
   const [loading, setLoading] = useState(true);
+  const [showDeclineModal, setShowDeclineModal] = useState(false);
+  const [showCancelModal, setShowCancelModal] = useState(false);
+  const [matchToProcess, setMatchToProcess] = useState(null);
   const [error, setError] = useState('');
   const [processingMatchId, setProcessingMatchId] = useState(null);
 
@@ -105,12 +109,17 @@ const DashboardPage = () => {
     }
   };
 
-  const handleRejectMatch = async (matchSlug) => {
-    if (!confirm('Are you sure you want to decline this request?')) return;
+  const handleRejectMatch = (matchSlug) => {
+    setMatchToProcess(matchSlug);
+    setShowDeclineModal(true);
+  };
+
+  const confirmRejectMatch = async () => {
+    if (!matchToProcess) return;
 
     try {
-      setProcessingMatchId(matchSlug);
-      await matchesAPI.deleteMatch(matchSlug);
+      setProcessingMatchId(matchToProcess);
+      await matchesAPI.deleteMatch(matchToProcess);
       toast.success('Request declined.');
       await loadDashboard();
     } catch (err) {
@@ -118,15 +127,22 @@ const DashboardPage = () => {
       toast.error('Failed to decline request. Please try again.');
     } finally {
       setProcessingMatchId(null);
+      setShowDeclineModal(false);
+      setMatchToProcess(null);
     }
   };
 
-  const handleCancelRequest = async (matchSlug) => {
-    if (!confirm('Are you sure you want to cancel this request?')) return;
+  const handleCancelRequest = (matchSlug) => {
+    setMatchToProcess(matchSlug);
+    setShowCancelModal(true);
+  };
+
+  const confirmCancelRequest = async () => {
+    if (!matchToProcess) return;
 
     try {
-      setProcessingMatchId(matchSlug);
-      await matchesAPI.deleteMatch(matchSlug);
+      setProcessingMatchId(matchToProcess);
+      await matchesAPI.deleteMatch(matchToProcess);
       toast.success('Request cancelled.');
       await loadDashboard();
     } catch (err) {
@@ -134,6 +150,8 @@ const DashboardPage = () => {
       toast.error('Failed to cancel request. Please try again.');
     } finally {
       setProcessingMatchId(null);
+      setShowCancelModal(false);
+      setMatchToProcess(null);
     }
   };
 
@@ -316,6 +334,38 @@ const DashboardPage = () => {
           </section>
         )}
       </div>
+
+      {/* Decline Confirmation Modal */}
+      <ConfirmationModal
+        isOpen={showDeclineModal}
+        onClose={() => {
+          setShowDeclineModal(false);
+          setMatchToProcess(null);
+        }}
+        onConfirm={confirmRejectMatch}
+        title="Decline Match Request"
+        message="Are you sure you want to decline this request? This action cannot be undone."
+        confirmText="Decline"
+        cancelText="Cancel"
+        isLoading={processingMatchId === matchToProcess}
+        loadingText="Declining..."
+      />
+
+      {/* Cancel Confirmation Modal */}
+      <ConfirmationModal
+        isOpen={showCancelModal}
+        onClose={() => {
+          setShowCancelModal(false);
+          setMatchToProcess(null);
+        }}
+        onConfirm={confirmCancelRequest}
+        title="Cancel Match Request"
+        message="Are you sure you want to cancel this request? This action cannot be undone."
+        confirmText="Cancel Request"
+        cancelText="Keep Request"
+        isLoading={processingMatchId === matchToProcess}
+        loadingText="Cancelling..."
+      />
     </Layout>
   );
 };

frontend/src/pages/MatchesPage.jsx

@@ -8,6 +8,7 @@ import { Loader2, Users } from 'lucide-react';
 import { connectSocket, disconnectSocket, getSocket } from '../services/socket';
 import { MatchCard } from '../components/matches';
 import { MATCH_STATUS, MATCH_FILTER } from '../constants';
+import ConfirmationModal from '../components/modals/ConfirmationModal';
 
 const MatchesPage = () => {
   const { user } = useAuth();
@@ -16,6 +17,8 @@ const MatchesPage = () => {
   const [loading, setLoading] = useState(true);
   const [filter, setFilter] = useState(MATCH_FILTER.ALL);
   const [processingMatchId, setProcessingMatchId] = useState(null);
+  const [showRejectModal, setShowRejectModal] = useState(false);
+  const [matchToReject, setMatchToReject] = useState(null);
 
   useEffect(() => {
     loadMatches();
@@ -90,22 +93,28 @@ const MatchesPage = () => {
     }
   };
 
-  const handleReject = async (matchSlug) => {
-    if (!confirm('Are you sure you want to reject this match request?')) {
-      return;
-    }
+  const handleReject = (matchSlug) => {
+    setMatchToReject(matchSlug);
+    setShowRejectModal(true);
+  };
+
+  const confirmReject = async () => {
+    if (!matchToReject) return;
 
     try {
-      setProcessingMatchId(matchSlug);
-      await matchesAPI.deleteMatch(matchSlug);
+      setProcessingMatchId(matchToReject);
+      await matchesAPI.deleteMatch(matchToReject);
 
       // Remove from list
-      setMatches(prev => prev.filter(m => m.slug !== matchSlug));
+      setMatches(prev => prev.filter(m => m.slug !== matchToReject));
+      toast.success('Match request rejected');
     } catch (error) {
       console.error('Failed to reject match:', error);
       toast.error('Failed to reject match. Please try again.');
     } finally {
       setProcessingMatchId(null);
+      setShowRejectModal(false);
+      setMatchToReject(null);
     }
   };
 
@@ -232,6 +241,22 @@ const MatchesPage = () => {
           </div>
         )}
       </div>
+
+      {/* Reject Confirmation Modal */}
+      <ConfirmationModal
+        isOpen={showRejectModal}
+        onClose={() => {
+          setShowRejectModal(false);
+          setMatchToReject(null);
+        }}
+        onConfirm={confirmReject}
+        title="Reject Match Request"
+        message="Are you sure you want to reject this match request? This action cannot be undone."
+        confirmText="Reject"
+        cancelText="Cancel"
+        isLoading={processingMatchId === matchToReject}
+        loadingText="Rejecting..."
+      />
     </Layout>
   );
 };

frontend/src/pages/admin/ContactMessagesPage.jsx

@@ -1,7 +1,9 @@
 import { useState, useEffect } from 'react';
 import { useNavigate } from 'react-router-dom';
+import toast from 'react-hot-toast';
 import { Mail, User, Calendar, Trash2, Check, Eye, AlertCircle, Loader2, Filter } from 'lucide-react';
 import Layout from '../../components/layout/Layout';
+import ConfirmationModal from '../../components/modals/ConfirmationModal';
 
 // This would normally come from an admin API module, but for now we'll add it inline
 const adminContactAPI = {
@@ -73,6 +75,8 @@ export default function ContactMessagesPage() {
   const [total, setTotal] = useState(0);
   const [statusFilter, setStatusFilter] = useState('all');
   const [selectedMessage, setSelectedMessage] = useState(null);
+  const [showDeleteModal, setShowDeleteModal] = useState(false);
+  const [messageToDelete, setMessageToDelete] = useState(null);
 
   useEffect(() => {
     const userData = localStorage.getItem('user');
@@ -115,19 +119,27 @@ export default function ContactMessagesPage() {
     }
   };
 
-  const handleDelete = async (id) => {
-    if (!confirm('Are you sure you want to delete this message?')) {
-      return;
-    }
+  const handleDelete = (id) => {
+    setMessageToDelete(id);
+    setShowDeleteModal(true);
+  };
+
+  const confirmDelete = async () => {
+    if (!messageToDelete) return;
 
     try {
-      await adminContactAPI.deleteMessage(id);
+      await adminContactAPI.deleteMessage(messageToDelete);
       await fetchMessages();
-      if (selectedMessage?.id === id) {
+      if (selectedMessage?.id === messageToDelete) {
         setSelectedMessage(null);
       }
+      toast.success('Message deleted successfully');
     } catch (error) {
       console.error('Failed to delete message:', error);
+      toast.error('Failed to delete message. Please try again.');
+    } finally {
+      setShowDeleteModal(false);
+      setMessageToDelete(null);
     }
   };
 
@@ -343,6 +355,20 @@ export default function ContactMessagesPage() {
           </div>
         </div>
       </div>
+
+      {/* Delete Confirmation Modal */}
+      <ConfirmationModal
+        isOpen={showDeleteModal}
+        onClose={() => {
+          setShowDeleteModal(false);
+          setMessageToDelete(null);
+        }}
+        onConfirm={confirmDelete}
+        title="Delete Message"
+        message="Are you sure you want to delete this contact message? This action cannot be undone."
+        confirmText="Delete"
+        cancelText="Cancel"
+      />
     </Layout>
   );
 }