refactor: complete Vite modernization and remove legacy styling layer

Author: Flatlogic Bot

.nvmrc

@@ -0,0 +1 @@
+22

babel.config.js

@@ -0,0 +1,41 @@
+const js = require('@eslint/js');
+const globals = require('globals');
+
+module.exports = [
+  {
+    ignores: ['build/**', 'node_modules/**'],
+  },
+  {
+    files: ['src/**/*.{js,jsx}'],
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+    },
+    rules: {
+      ...js.configs.recommended.rules,
+      'no-case-declarations': 'warn',
+      'no-extra-boolean-cast': 'warn',
+      'no-prototype-builtins': 'warn',
+      'no-unused-vars': 'warn',
+      'no-useless-assignment': 'warn',
+    },
+  },
+  {
+    files: ['src/test/**/*.{js,jsx}'],
+    languageOptions: {
+      globals: {
+        ...globals.jest,
+        vi: 'readonly',
+      },
+    },
+  },
+];