various fixes to imports and filtering;

some API rewrited

next.config.js

@@ -1,7 +1,11 @@
 const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
 
 const withPWA = require('next-pwa')({
-  dest: 'public'
+  dest: 'public',
+  register: true, // ?
+  publicExcludes: ["!_error*.js"], //?
+
+  disable: process.env.NODE_ENV === 'development',
 })
 
 module.exports = withPWA({