feat: implement core course platform UI and logic

- Add project configuration and git ignore rules
- Implement App router with protected routes
- Develop course player, grid, and card components
- Add state management for course progress and navigation
- Initialize database services for course and comment data

context/AuthContext.tsx

@@ -0,0 +1,69 @@
+import React, { createContext, useContext, useState, useEffect } from 'react';
+import { User, UserRole } from '../types';
+
+interface AuthContextType {
+  user: User | null;
+  login: (email: string) => boolean;
+  logout: () => void;
+  isLoading: boolean;
+}
+
+const AuthContext = createContext<AuthContextType | undefined>(undefined);
+
+export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
+  const [user, setUser] = useState<User | null>(null);
+  const [isLoading, setIsLoading] = useState(true);
+
+  useEffect(() => {
+    // Check localStorage on mount with error handling
+    const storedUser = localStorage.getItem('educlean_user');
+    if (storedUser) {
+      try {
+        const parsedUser = JSON.parse(storedUser);
+        if (parsedUser && parsedUser.email) {
+            setUser(parsedUser);
+        }
+      } catch (error) {
+        console.error("Failed to parse user session, clearing storage:", error);
+        localStorage.removeItem('educlean_user');
+      }
+    }
+    setIsLoading(false);
+  }, []);
+
+  const login = (email: string): boolean => {
+    let newUser: User | null = null;
+
+    if (email === 'admin@prof.com') {
+      newUser = { email, name: 'Prof. Anderson', role: 'professor' };
+    } else if (email === 'aluno@test.com') {
+      newUser = { email, name: 'Aluno Demo', role: 'student' };
+    }
+
+    if (newUser) {
+      setUser(newUser);
+      localStorage.setItem('educlean_user', JSON.stringify(newUser));
+      return true;
+    }
+    return false;
+  };
+
+  const logout = () => {
+    setUser(null);
+    localStorage.removeItem('educlean_user');
+  };
+
+  return (
+    <AuthContext.Provider value={{ user, login, logout, isLoading }}>
+      {children}
+    </AuthContext.Provider>
+  );
+};
+
+export const useAuth = () => {
+  const context = useContext(AuthContext);
+  if (context === undefined) {
+    throw new Error('useAuth must be used within an AuthProvider');
+  }
+  return context;
+};