chore(deps): bump dependencies and migrate to ESLint 9 flat config

- Bump @babel/core, @babel/preset-* to latest 7.x
- Bump jest, babel-jest, jest-environment-jsdom to ^30.3.0
- Bump @testing-library/jest-dom to ^6.9.1
- Bump @testing-library/user-event to 14.6.1
- Bump concurrently to ^9.2.1, prettier to 3.8.1, typescript to ^5.9.3
- Bump file-saver to ^2.0.5, xterm to ^5.3.0, rimraf to ^6.1.3
- Bump monaco-editor to ^0.55.1, serve to ^14.2.6, tslib to ^2.8.1
- Migrate ESLint 8 to ESLint 9 with flat config
- Replace @typescript-eslint/eslint-plugin + parser with typescript-eslint v8
- Replace eslint-plugin-markdown with @eslint/markdown
- Remove eslint-config-standard-with-typescript, eslint-plugin-n,
  eslint-plugin-prettier, eslint-plugin-promise, eslint-plugin-import
- Replace react-jss with inline styles (removes vulnerable @babel/runtime)
- Reduce audit vulnerabilities from 91 to 73, eliminate critical severity

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

Author: nicolethoen

.eslintignore

@@ -0,0 +1,61 @@
+import markdown from '@eslint/markdown';
+import react from 'eslint-plugin-react';
+
+export default [
+  {
+    ignores: [
+      '**/dist/**',
+      '**/public/**',
+      '**/.cache/**',
+      '**/node_modules/**',
+      '**/generated/**',
+      '**/CHANGELOG.md',
+      '**/*.js',
+      '**/*.jsx',
+      '**/*.ts',
+      '**/*.tsx'
+    ]
+  },
+  {
+    files: ['packages/**/*.md'],
+    plugins: {
+      markdown
+    },
+    language: 'markdown/gfm',
+    rules: {
+      'markdown/no-multiple-h1': 'off',
+      'markdown/heading-increment': 'off',
+      'markdown/no-missing-label-refs': 'off'
+    }
+  },
+  {
+    files: ['packages/**/*.md/*.js', 'packages/**/*.md/*.jsx'],
+    plugins: {
+      react
+    },
+    languageOptions: {
+      ecmaVersion: 2020,
+      sourceType: 'module',
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true
+        }
+      }
+    },
+    settings: {
+      react: {
+        version: '18'
+      }
+    },
+    rules: {
+      'eol-last': 'error',
+      'spaced-comment': 'error',
+      'no-unused-vars': 'off',
+      'no-this-before-super': 'error',
+      'react/jsx-uses-react': 'error',
+      'react/jsx-uses-vars': 'error',
+      'react/no-unknown-property': 'error',
+      'react/jsx-no-undef': 'error'
+    }
+  }
+];

.eslintrc-md.json

@@ -0,0 +1,126 @@
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import react from 'eslint-plugin-react';
+import reactHooks from 'eslint-plugin-react-hooks';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
+
+export default [
+  {
+    ignores: [
+      '**/dist/**',
+      '**/public/**',
+      '**/.cache/**',
+      '**/node_modules/**',
+      '**/*.md',
+      '**/tsc_out/**',
+      '**/.out/**',
+      '**/.changelog/**',
+      '**/coverage/**',
+      '**/.tmp/**',
+      '**/generated/**'
+    ]
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    files: ['packages/**/*.{js,jsx,ts,tsx}'],
+    plugins: {
+      react,
+      'react-hooks': reactHooks
+    },
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      },
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true
+        }
+      }
+    },
+    settings: {
+      react: {
+        version: 'detect'
+      }
+    },
+    rules: {
+      ...react.configs.recommended.rules,
+      ...react.configs['jsx-runtime'].rules,
+      ...reactHooks.configs.recommended.rules,
+
+      '@typescript-eslint/adjacent-overload-signatures': 'error',
+      '@typescript-eslint/array-type': 'error',
+      '@typescript-eslint/consistent-type-assertions': 'error',
+      '@typescript-eslint/consistent-type-definitions': 'error',
+      '@typescript-eslint/no-misused-new': 'error',
+      '@typescript-eslint/no-namespace': 'error',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_'
+        }
+      ],
+      '@typescript-eslint/prefer-for-of': 'error',
+      '@typescript-eslint/prefer-function-type': 'error',
+      '@typescript-eslint/prefer-namespace-keyword': 'error',
+      '@typescript-eslint/unified-signatures': 'error',
+      '@typescript-eslint/no-require-imports': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      'arrow-body-style': 'error',
+      camelcase: [
+        'error',
+        {
+          ignoreDestructuring: true
+        }
+      ],
+      'constructor-super': 'error',
+      curly: 'error',
+      'dot-notation': 'error',
+      eqeqeq: ['error', 'smart'],
+      'guard-for-in': 'error',
+      'max-classes-per-file': ['error', 1],
+      'no-nested-ternary': 'error',
+      'no-bitwise': 'error',
+      'no-caller': 'error',
+      'no-cond-assign': 'error',
+      'no-console': 'error',
+      'no-debugger': 'error',
+      'no-empty': 'error',
+      'no-eval': 'error',
+      'no-new-wrappers': 'error',
+      'no-undef-init': 'error',
+      'no-unsafe-finally': 'error',
+      'no-unused-expressions': 'off',
+      '@typescript-eslint/no-unused-expressions': [
+        'error',
+        {
+          allowTernary: true,
+          allowShortCircuit: true
+        }
+      ],
+      'no-unused-labels': 'error',
+      'no-var': 'error',
+      'object-shorthand': 'error',
+      'one-var': ['error', 'never'],
+      'prefer-const': 'error',
+      radix: ['error', 'as-needed'],
+      'react/prop-types': 0,
+      'react/display-name': 0,
+      'react-hooks/exhaustive-deps': 'warn',
+      'react/no-unescaped-entities': ['error', { forbid: ['>', '}'] }],
+      'spaced-comment': 'error',
+      'use-isnan': 'error'
+    }
+  },
+  {
+    files: ['**/patternfly-docs/pages/*'],
+    rules: {
+      'arrow-body-style': 'off'
+    }
+  }
+];