Upgrade to Svelte 4 (#3543)

.eslintignore

@@ -1 +1,2 @@
+web-admin/build
 web-local/build

.eslintrc.cjs

@@ -1,29 +1,37 @@
 module.exports = {
   root: true,
-  parser: "@typescript-eslint/parser",
   extends: [
     "eslint:recommended",
     "plugin:@typescript-eslint/recommended",
+    'plugin:svelte/recommended',
     "prettier",
   ],
-  plugins: ["svelte3", "@typescript-eslint"],
-  ignorePatterns: ["*.cjs"],
-  overrides: [{ files: ["*.svelte"], processor: "svelte3/svelte3" }],
-  settings: {
-    "svelte3/typescript": () => require("typescript"),
-  },
+  parser: "@typescript-eslint/parser",
+  plugins: ["@typescript-eslint"],
   parserOptions: {
     sourceType: "module",
     ecmaVersion: 2019,
+    extraFileExtensions: [".svelte"],
   },
   env: {
     browser: true,
     es2017: true,
     node: true,
   },
+  overrides: [
+    {
+      files: ['*.svelte'],
+      parser: 'svelte-eslint-parser',
+      parserOptions: {
+        parser: '@typescript-eslint/parser'
+      }
+    }
+  ],
+  ignorePatterns: ["*.cjs"],
   rules: {
     "@typescript-eslint/no-explicit-any": "warn",
     "@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
     "@typescript-eslint/ban-ts-comment": "warn",
+    "svelte/no-at-html-tags": "warn",
   },
 };