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

functions/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "functions",
+  "description": "Cloud Functions for Firebase",
+  "scripts": {
+    "serve": "firebase emulators:start --only functions",
+    "shell": "firebase functions:shell",
+    "start": "npm run shell",
+    "deploy": "firebase deploy --only functions",
+    "logs": "firebase functions:log"
+  },
+  "engines": {
+    "node": "18"
+  },
+  "main": "index.js",
+  "dependencies": {
+    "firebase-admin": "^12.1.0",
+    "firebase-functions": "^5.0.0",
+    "nodemailer": "^6.9.0",
+    "cors": "^2.8.5"
+  },
+  "devDependencies": {
+    "firebase-functions-test": "^3.1.0"
+  },
+  "private": true
+}