feat: Complete Mail Composer with EmailJS integration

- Rich email composer with formatting tools (bold, italic, underline, links)
- Multi-recipient support (To, CC, BCC fields)
- File attachments with drag & drop support
- Priority levels and email validation
- Draft management with auto-save and cloud sync
- Real email sending via EmailJS integration
- Responsive design for mobile and desktop
- Comprehensive error handling and fallback modes
- Complete documentation and setup guides
- Firebase integration ready for advanced features

Features:
✅ Real email sending (EmailJS)
✅ Rich text editor
✅ File attachments
✅ Draft management
✅ Form validation
✅ Responsive UI
✅ Error handling
✅ Documentation

firebase-config.js

@@ -0,0 +1,31 @@
+// Firebase configuration
+import { initializeApp } from 'firebase/app';
+import { getFirestore } from 'firebase/firestore';
+import { getFunctions, httpsCallable } from 'firebase/functions';
+
+// Your Firebase config object
+// These values come from environment variables
+const firebaseConfig = {
+  apiKey: import.meta.env.VITE_FIREBASE_API_KEY || "your-api-key",
+  authDomain: import.meta.env.VITE_FIREBASE_AUTH_DOMAIN || "your-project.firebaseapp.com",
+  projectId: import.meta.env.VITE_FIREBASE_PROJECT_ID || "your-project-id",
+  storageBucket: import.meta.env.VITE_FIREBASE_STORAGE_BUCKET || "your-project.appspot.com",
+  messagingSenderId: import.meta.env.VITE_FIREBASE_MESSAGING_SENDER_ID || "123456789",
+  appId: import.meta.env.VITE_FIREBASE_APP_ID || "your-app-id"
+};
+
+// Initialize Firebase
+const app = initializeApp(firebaseConfig);
+export const db = getFirestore(app);
+export const functions = getFunctions(app);
+
+// Email sending function
+export const sendEmail = httpsCallable(functions, 'sendEmail');
+
+// Test email configuration
+export const testEmailConfig = httpsCallable(functions, 'testEmailConfig');
+
+// Get email logs (for admin)
+export const getEmailLogs = httpsCallable(functions, 'getEmailLogs');
+
+export default app;