feat(lazy-loading): implement lazy loading and suspense for improved performance

- Added lazy loading for NotFoundPage and TaskListFilters components to enhance initial load times.
- Wrapped lazy-loaded components in Suspense boundaries to provide loading states and improve user experience.
- Updated Vite configuration to optimize chunking strategy and preserve module signatures for better dependency management.

worklenz-frontend/index.html

@@ -13,7 +13,7 @@
   <title>Worklenz</title>
 
   <!-- Environment configuration -->
-  <script src="/env-config.js"></script>
+  <script type="module" src="/env-config.js"></script>
   <!-- Unregister service worker -->
   <script src="/unregister-sw.js"></script>
   <!-- Microsoft Clarity -->