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/modules/recordings/recordings.service.ts

@@ -68,7 +68,7 @@ export class RecordingsService {
     const items = rows.slice(0, limit) as unknown as RecordingRow[];
     const hasMore = rows.length > limit;
     const nextCursor = hasMore
-      ? String(items[items.length - 1]!.created_at)
+      ? String(items[items.length - 1]?.created_at)
       : null;
 
     return { items, nextCursor, hasMore };