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/discord-gateway/src/modules/ai-moderation/moderationPrompt.ts

@@ -795,7 +795,7 @@ export function sanitizeAiContent(
   // 3. Cap length
   const capped =
     escaped.length > maxLen
-      ? escaped.slice(0, maxLen) + "…[truncated]"
+      ? `${escaped.slice(0, maxLen)}…[truncated]`
       : escaped;
 
   // 4. Wrap in CDATA unless the caller opts out (e.g. plain-text contexts)