refactor(frontend): replace status string literals with constants

- Create constants/statuses.js with MATCH_STATUS, SUGGESTION_STATUS, MATCH_FILTER
- Update MatchCard, MatchesPage, HistoryPage, RatePartnerPage to use MATCH_STATUS
- Update RecordingTab to use SUGGESTION_STATUS
- Update Navbar to use MATCH_STATUS for API calls

frontend/src/components/layout/Navbar.jsx

@@ -5,6 +5,7 @@ import Avatar from '../common/Avatar';
 import { useState, useEffect } from 'react';
 import { matchesAPI } from '../../services/api';
 import { connectSocket, disconnectSocket, getSocket } from '../../services/socket';
+import { MATCH_STATUS } from '../../constants';
 
 const Navbar = () => {
   const { user, logout } = useAuth();
@@ -48,7 +49,7 @@ const Navbar = () => {
 
   const loadPendingMatches = async () => {
     try {
-      const result = await matchesAPI.getMatches(null, 'pending');
+      const result = await matchesAPI.getMatches(null, MATCH_STATUS.PENDING);
       // Only count incoming requests (where user is not the initiator)
       const incomingCount = (result.data || []).filter(m => !m.isInitiator).length;
       setPendingMatchesCount(incomingCount);

frontend/src/components/matches/MatchCard.jsx

@@ -1,14 +1,15 @@
 import { Link } from 'react-router-dom';
 import { MessageCircle, Check, X, Loader2, Calendar, MapPin } from 'lucide-react';
+import { MATCH_STATUS } from '../../constants';
 
 /**
  * Match card for matches list page
  * Shows match details with accept/reject/chat actions
  */
 const MatchCard = ({ match, onAccept, onReject, onOpenChat, processing }) => {
-  const isIncoming = !match.isInitiator && match.status === 'pending';
-  const isOutgoing = match.isInitiator && match.status === 'pending';
-  const isAccepted = match.status === 'accepted';
+  const isIncoming = !match.isInitiator && match.status === MATCH_STATUS.PENDING;
+  const isOutgoing = match.isInitiator && match.status === MATCH_STATUS.PENDING;
+  const isAccepted = match.status === MATCH_STATUS.ACCEPTED;
 
   return (
     <div className="bg-white rounded-lg shadow-sm border border-gray-200 p-4 hover:shadow-md transition-shadow">

frontend/src/components/recordings/RecordingTab.jsx

@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react';
 import { Video, VideoOff, Clock, CheckCircle, XCircle, AlertTriangle, RefreshCw } from 'lucide-react';
 import { matchingAPI } from '../../services/api';
 import Avatar from '../common/Avatar';
+import { SUGGESTION_STATUS } from '../../constants';
 
 /**
  * RecordingTab - Main component for managing recording partnerships
@@ -199,8 +200,8 @@ const RecordingTab = ({ slug, event, myHeats }) => {
                 key={suggestion.id || suggestion.heat?.id}
                 suggestion={suggestion}
                 type="toBeRecorded"
-                onAccept={() => handleUpdateStatus(suggestion.id, 'accepted')}
-                onReject={() => handleUpdateStatus(suggestion.id, 'rejected')}
+                onAccept={() => handleUpdateStatus(suggestion.id, SUGGESTION_STATUS.ACCEPTED)}
+                onReject={() => handleUpdateStatus(suggestion.id, SUGGESTION_STATUS.REJECTED)}
               />
             ))}
           </div>
@@ -225,8 +226,8 @@ const RecordingTab = ({ slug, event, myHeats }) => {
                 key={suggestion.id || suggestion.heat?.id}
                 suggestion={suggestion}
                 type="toRecord"
-                onAccept={() => handleUpdateStatus(suggestion.id, 'accepted')}
-                onReject={() => handleUpdateStatus(suggestion.id, 'rejected')}
+                onAccept={() => handleUpdateStatus(suggestion.id, SUGGESTION_STATUS.ACCEPTED)}
+                onReject={() => handleUpdateStatus(suggestion.id, SUGGESTION_STATUS.REJECTED)}
               />
             ))}
           </div>
@@ -278,21 +279,21 @@ const SuggestionCard = ({ suggestion, type, onAccept, onReject }) => {
   // Status badge
   const getStatusBadge = () => {
     switch (status) {
-      case 'accepted':
+      case SUGGESTION_STATUS.ACCEPTED:
         return (
           <span className="inline-flex items-center gap-1 px-2 py-0.5 text-xs font-medium bg-green-100 text-green-800 rounded">
             <CheckCircle className="w-3 h-3" />
             Zaakceptowano
           </span>
         );
-      case 'rejected':
+      case SUGGESTION_STATUS.REJECTED:
         return (
           <span className="inline-flex items-center gap-1 px-2 py-0.5 text-xs font-medium bg-red-100 text-red-800 rounded">
             <XCircle className="w-3 h-3" />
             Odrzucono
           </span>
         );
-      case 'not_found':
+      case SUGGESTION_STATUS.NOT_FOUND:
         return (
           <span className="inline-flex items-center gap-1 px-2 py-0.5 text-xs font-medium bg-amber-100 text-amber-800 rounded">
             <AlertTriangle className="w-3 h-3" />
@@ -305,7 +306,7 @@ const SuggestionCard = ({ suggestion, type, onAccept, onReject }) => {
   };
 
   // No recorder found
-  if (status === 'not_found') {
+  if (status === SUGGESTION_STATUS.NOT_FOUND) {
     return (
       <div className="flex items-center justify-between p-3 bg-amber-50 border border-amber-200 rounded-lg">
         <div className="flex items-center gap-3">
@@ -346,7 +347,7 @@ const SuggestionCard = ({ suggestion, type, onAccept, onReject }) => {
       </div>
 
       <div className="flex items-center gap-2">
-        {status === 'pending' ? (
+        {status === SUGGESTION_STATUS.PENDING ? (
           <>
             <button
               onClick={onAccept}

frontend/src/constants/index.js

@@ -0,0 +1 @@
+export { MATCH_STATUS, SUGGESTION_STATUS, MATCH_FILTER } from './statuses';

frontend/src/constants/statuses.js

@@ -0,0 +1,28 @@
+/**
+ * Match status constants
+ */
+export const MATCH_STATUS = {
+  PENDING: 'pending',
+  ACCEPTED: 'accepted',
+  REJECTED: 'rejected',
+  COMPLETED: 'completed',
+};
+
+/**
+ * Suggestion status constants (for auto-matching)
+ */
+export const SUGGESTION_STATUS = {
+  PENDING: 'pending',
+  ACCEPTED: 'accepted',
+  REJECTED: 'rejected',
+  NOT_FOUND: 'not_found',
+};
+
+/**
+ * Filter options for matches list
+ */
+export const MATCH_FILTER = {
+  ALL: 'all',
+  PENDING: 'pending',
+  ACCEPTED: 'accepted',
+};

frontend/src/pages/HistoryPage.jsx

@@ -1,6 +1,7 @@
 import Layout from '../components/layout/Layout';
 import { mockMatches, mockRatings } from '../mocks/matches';
 import { Calendar, MapPin, Star, MessageCircle } from 'lucide-react';
+import { MATCH_STATUS } from '../constants';
 
 const HistoryPage = () => {
   return (
@@ -42,12 +43,12 @@ const HistoryPage = () => {
                   <div>
                     <span
                       className={`px-3 py-1 rounded-full text-sm font-medium ${
-                        match.status === 'completed'
+                        match.status === MATCH_STATUS.COMPLETED
                           ? 'bg-green-100 text-green-800'
                           : 'bg-blue-100 text-blue-800'
                       }`}
                     >
-                      {match.status === 'completed' ? 'Completed' : 'Active'}
+                      {match.status === MATCH_STATUS.COMPLETED ? 'Completed' : 'Active'}
                     </span>
                   </div>
                 </div>

frontend/src/pages/MatchesPage.jsx

@@ -6,13 +6,14 @@ import { matchesAPI } from '../services/api';
 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';
 
 const MatchesPage = () => {
   const { user } = useAuth();
   const navigate = useNavigate();
   const [matches, setMatches] = useState([]);
   const [loading, setLoading] = useState(true);
-  const [filter, setFilter] = useState('all'); // 'all', 'pending', 'accepted'
+  const [filter, setFilter] = useState(MATCH_FILTER.ALL);
   const [processingMatchId, setProcessingMatchId] = useState(null);
 
   useEffect(() => {
@@ -108,20 +109,20 @@ const MatchesPage = () => {
   };
 
   const handleOpenChat = (match) => {
-    if (match.status === 'accepted' && match.roomId) {
+    if (match.status === MATCH_STATUS.ACCEPTED && match.roomId) {
       navigate(`/matches/${match.slug}/chat`);
     }
   };
 
   // Filter matches based on selected filter
   const filteredMatches = matches.filter(match => {
-    if (filter === 'all') return true;
+    if (filter === MATCH_FILTER.ALL) return true;
     return match.status === filter;
   });
 
   // Separate pending incoming matches (where user is recipient)
-  const pendingIncoming = filteredMatches.filter(m => m.status === 'pending' && !m.isInitiator);
-  const otherMatches = filteredMatches.filter(m => !(m.status === 'pending' && !m.isInitiator));
+  const pendingIncoming = filteredMatches.filter(m => m.status === MATCH_STATUS.PENDING && !m.isInitiator);
+  const otherMatches = filteredMatches.filter(m => !(m.status === MATCH_STATUS.PENDING && !m.isInitiator));
 
   return (
     <Layout>
@@ -136,9 +137,9 @@ const MatchesPage = () => {
         {/* Filter Tabs */}
         <div className="bg-white rounded-lg shadow-sm p-1 mb-6 flex gap-1">
           <button
-            onClick={() => setFilter('all')}
+            onClick={() => setFilter(MATCH_FILTER.ALL)}
             className={`flex-1 px-4 py-2 rounded-md text-sm font-medium transition-colors ${
-              filter === 'all'
+              filter === MATCH_FILTER.ALL
                 ? 'bg-primary-600 text-white'
                 : 'text-gray-600 hover:bg-gray-100'
             }`}
@@ -146,24 +147,24 @@ const MatchesPage = () => {
             All ({matches.length})
           </button>
           <button
-            onClick={() => setFilter('pending')}
+            onClick={() => setFilter(MATCH_FILTER.PENDING)}
             className={`flex-1 px-4 py-2 rounded-md text-sm font-medium transition-colors ${
-              filter === 'pending'
+              filter === MATCH_FILTER.PENDING
                 ? 'bg-primary-600 text-white'
                 : 'text-gray-600 hover:bg-gray-100'
             }`}
           >
-            Pending ({matches.filter(m => m.status === 'pending').length})
+            Pending ({matches.filter(m => m.status === MATCH_STATUS.PENDING).length})
           </button>
           <button
-            onClick={() => setFilter('accepted')}
+            onClick={() => setFilter(MATCH_FILTER.ACCEPTED)}
             className={`flex-1 px-4 py-2 rounded-md text-sm font-medium transition-colors ${
-              filter === 'accepted'
+              filter === MATCH_FILTER.ACCEPTED
                 ? 'bg-primary-600 text-white'
                 : 'text-gray-600 hover:bg-gray-100'
             }`}
           >
-            Active ({matches.filter(m => m.status === 'accepted').length})
+            Active ({matches.filter(m => m.status === MATCH_STATUS.ACCEPTED).length})
           </button>
         </div>
 

frontend/src/pages/RatePartnerPage.jsx

@@ -3,6 +3,7 @@ import { useParams, useNavigate } from 'react-router-dom';
 import Layout from '../components/layout/Layout';
 import { matchesAPI } from '../services/api';
 import { Star, Loader2 } from 'lucide-react';
+import { MATCH_STATUS } from '../constants';
 
 const RatePartnerPage = () => {
   const { slug } = useParams();
@@ -24,7 +25,7 @@ const RatePartnerPage = () => {
         setMatch(result.data);
 
         // Check if this match can be rated
-        if (result.data.status !== 'accepted' && result.data.status !== 'completed') {
+        if (result.data.status !== MATCH_STATUS.ACCEPTED && result.data.status !== MATCH_STATUS.COMPLETED) {
           alert('This match must be accepted before rating.');
           navigate('/matches');
           return;