feat(gantt-integration): add SVAR Gantt chart component and related features

- Integrated SVAR Gantt chart into the project view for enhanced task visualization.
- Implemented lazy loading for improved performance and reduced initial bundle size.
- Added custom styles for light and dark themes to match Worklenz branding.
- Updated Redux state management to support Gantt-specific data handling.
- Introduced a ResourcePreloader component to preload critical chunks for better navigation performance.
- Enhanced project view to support Gantt as a new project view option.
- Documented Gantt integration details and usage in README.md.

worklenz-frontend/index.html

@@ -10,6 +10,8 @@
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&display=swap"
     rel="stylesheet" />
+  <!-- SVAR Gantt Icons -->
+  <link rel="stylesheet" href="https://cdn.svar.dev/fonts/wxi/wx-icons.css" />
   <title>Worklenz</title>
 
   <!-- Environment configuration -->