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

EMAILJS_SETUP.md

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+# Quick Email Setup with EmailJS
+
+## 🚀 Get Real Email Sending in 5 Minutes!
+
+EmailJS is the fastest way to get your mail composer sending real emails without server setup.
+
+## Step 1: Create EmailJS Account
+
+1. Go to [https://www.emailjs.com/](https://www.emailjs.com/)
+2. Sign up for a free account
+3. Verify your email
+
+## Step 2: Create Email Service
+
+1. In EmailJS dashboard, go to **Email Services**
+2. Click **Add New Service**
+3. Choose your email provider:
+   - **Gmail** (easiest for personal use)
+   - **Outlook**
+   - **Yahoo**
+   - **Custom SMTP**
+
+### For Gmail:
+1. Select "Gmail"
+2. Click "Connect Account"
+3. Sign in with your Gmail account
+4. Allow EmailJS access
+5. Copy the **Service ID** (e.g., `service_abc123`)
+
+## Step 3: Create Email Template
+
+1. Go to **Email Templates**
+2. Click **Create New Template**
+3. Use this template content:
+
+**Subject:**
+```
+{{subject}}
+```
+
+**Content:**
+```html
+<p><strong>From:</strong> {{from_name}}</p>
+<p><strong>To:</strong> {{to_email}}</p>
+<p><strong>CC:</strong> {{cc_email}}</p>
+<p><strong>Priority:</strong> {{priority}}</p>
+
+<hr>
+
+<div>
+{{{message}}}
+</div>
+
+<hr>
+<p><em>Sent via Mail Composer App</em></p>
+```
+
+4. Save the template and copy the **Template ID** (e.g., `template_xyz789`)
+
+## Step 4: Get Public Key
+
+1. Go to **Account** → **General**
+2. Copy your **Public Key** (e.g., `user_abcd1234`)
+
+## Step 5: Configure Your App
+
+1. Open `emailjs-config.js`
+2. Replace the placeholder values:
+
+```javascript
+const EMAILJS_CONFIG = {
+  SERVICE_ID: 'service_abc123',        // Your Service ID
+  TEMPLATE_ID: 'template_xyz789',      // Your Template ID  
+  PUBLIC_KEY: 'user_abcd1234'          // Your Public Key
+};
+```
+
+## Step 6: Test Email Sending
+
+1. Start your app: `npm run dev`
+2. Open http://localhost:5173
+3. Compose and send a test email
+4. Check your recipient's inbox!
+
+## ✅ That's It!
+
+Your mail composer can now send real emails! 
+
+### Free Plan Limits:
+- **200 emails/month**
+- **EmailJS branding** in emails
+- **Basic support**
+
+### Need More?
+- Upgrade to paid plan for higher limits
+- Or set up Firebase for unlimited sending
+
+## Troubleshooting
+
+### Common Issues:
+
+1. **"Service not found" error**
+   - Double-check your Service ID
+   - Make sure the service is active in EmailJS dashboard
+
+2. **"Template not found" error**
+   - Verify your Template ID
+   - Ensure template is published
+
+3. **"Invalid public key" error**
+   - Check your Public Key in Account settings
+   - Make sure it's the correct format
+
+4. **Emails not delivered**
+   - Check spam/junk folder
+   - Verify recipient email addresses
+   - Check EmailJS dashboard for send logs
+
+### Test Mode
+If you haven't configured EmailJS yet, the app runs in demo mode with simulated sending.
+
+## Next Steps
+
+Once EmailJS is working:
+- **Customize the email template** with your branding
+- **Add more email services** as backups
+- **Set up Firebase** for advanced features (unlimited sending, analytics)
+- **Add user authentication** for multi-user support
+
+Happy emailing! 📧