feat: implement comprehensive email system with rate limiting and extensive test suite

- Add robust email service with rate limiting and configuration management
- Implement shared rate limiter utility for consistent API protection
- Create comprehensive test suite for core processing pipeline
- Add API tests for dashboard metrics and authentication routes
- Fix date range picker infinite loop issue
- Improve session lookup in refresh sessions API
- Refactor session API routing with better code organization
- Update processing pipeline status monitoring
- Clean up leftover files and improve code formatting

components/MessageViewer.tsx

@@ -71,7 +71,8 @@ export default function MessageViewer({ messages }: MessageViewerProps) {
               : "No timestamp"}
           </span>
           <span>
-            Last message: {(() => {
+            Last message:{" "}
+            {(() => {
               const lastMessage = messages[messages.length - 1];
               return lastMessage.timestamp
                 ? new Date(lastMessage.timestamp).toLocaleString()