feat: enhance ExportDropdown and PublicationsTable components for improved export functionality

- Update ExportDropdown to support selected item count and use new icons for formats
- Refactor PublicationsTable to include tri-state checkbox for selection management and year filtering
- Modify DashboardPage to handle selected publication IDs for export
- Adjust API service to support selective export based on publication IDs

frontend/vite.config.js

@@ -4,7 +4,7 @@ import tailwindcss from '@tailwindcss/vite'
 
 // https://vite.dev/config/
 export default defineConfig(({ mode }) => {
-  const env = loadEnv(mode, process.cwd(), '')
+  const env = loadEnv(mode, import.meta.dirname, '')
   const proxyTarget = env.VITE_API_PROXY_TARGET || 'http://localhost:8000'
 
   return {