feat: update dependencies and improve dashboard functionality

- Added new dependencies for Next.js and lucide-react in pnpm-workspace.yaml.
- Refactored DashboardPage component to improve readability and error handling.
- Enhanced Header component to display error status with an alert icon.
- Updated MobileTabBar and Sidebar components to use a centralized tabs definition.
- Improved ChannelsView in dashboard-panel to handle channel fetching more cleanly.
- Fixed ActiveSpeaker type to use camelCase for userId.
- Updated MessagesPanel to handle guildId checks more gracefully.
- Adjusted API calls in dashboard and messages to align with backend expectations.
- Refined type definitions across various interfaces for consistency and clarity.

services/backend/src/index.ts

@@ -28,7 +28,7 @@ async function shutdown(signal: string) {
     // 1. Stop accepting new HTTP connections
     if (httpServer) {
       await new Promise<void>((resolve) => {
-        httpServer!.close(() => {
+        httpServer?.close(() => {
           logger.info("HTTP server closed");
           resolve();
         });