Refactor Next.js configuration and remove Sentry integration

- Updated `serverExternalPackages` in the Next.js configuration to exclude `@sentry/node`, improving compatibility with React's RSC/client boundary.
- Removed the `instrumentation.ts` file and refactored Sentry-related code to a no-op, ensuring it does not interfere with the Next.js build process.
- Simplified the dashboard page by integrating `DashboardGuildGrid`, enhancing the user interface and reducing complexity in the component structure.

apps/webui/package.json

@@ -23,7 +23,6 @@
     "@radix-ui/react-separator": "^1.1.12",
     "@radix-ui/react-slot": "^1.3.0",
     "@radix-ui/react-switch": "^1.3.4",
-    "@sentry/node": "^10.67.0",
     "bullmq": "^5.34.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",