Fix file sharing load speed and move error; misc updates

- Remove recursive directory size calculations (single Seafile API call per list)
- Remove 'Used in this location' usage display
- Fix move using v2 per-type endpoints instead of broken batch endpoint
- Send entry type from frontend for correct move routing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

vite.config.js

@@ -4,4 +4,14 @@ import react from '@vitejs/plugin-react'
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react()],
+  build: {
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          if (id.includes('node_modules/jspdf')) return 'pdf-libs';
+          if (id.includes('node_modules/react') || id.includes('node_modules/react-dom') || id.includes('node_modules/react-router')) return 'react-vendor';
+        },
+      },
+    },
+  },
 })