added files in git

src/context/UnreadContext.jsx

@@ -0,0 +1,50 @@
+import { createContext, useContext, useState, useCallback, useMemo } from 'react';
+
+const UnreadContext = createContext(null);
+
+export function UnreadProvider({ children }) {
+  const [unreadMap, setUnreadMap] = useState({});
+
+  const setChatUnread = useCallback((chatId, count) => {
+    setUnreadMap(prev => ({ ...prev, [chatId]: count }));
+  }, []);
+
+  const clearChatUnread = useCallback((chatId) => {
+    setUnreadMap(prev => {
+      if (prev[chatId] === undefined) return prev;
+      const next = { ...prev };
+      delete next[chatId];
+      return next;
+    });
+  }, []);
+
+  const updateFromChats = useCallback((chats) => {
+    setUnreadMap(prev => {
+      const next = { ...prev };
+      for (const chat of chats) {
+        const count = chat.unreadCount ?? chat.unreadMessages ?? 0;
+        if (count > 0) {
+          next[chat.id] = count;
+        }
+      }
+      return next;
+    });
+  }, []);
+
+  const totalUnread = useMemo(() =>
+    Object.values(unreadMap).reduce((sum, c) => sum + c, 0),
+    [unreadMap]
+  );
+
+  return (
+    <UnreadContext.Provider value={{ unreadMap, totalUnread, setChatUnread, clearChatUnread, updateFromChats }}>
+      {children}
+    </UnreadContext.Provider>
+  );
+}
+
+export function useUnread() {
+  const ctx = useContext(UnreadContext);
+  if (!ctx) throw new Error('useUnread must be used within UnreadProvider');
+  return ctx;
+}