fix: resolve linting errors in componentLocalPreview.nut.ts

- Changed dotenv import pattern from default to star import for better ESM compatibility
- Added .nut.ts files to test tsconfig.json includes
- Removed eslint-disable comments and fixed TypeScript type issues
- Installed missing dependencies

Author: lesya7

package.json

@@ -261,7 +261,7 @@
   "exports": "./lib/index.js",
   "type": "module",
   "volta": {
-    "node": "20.11.0",
+    "node": "20.19.3",
     "yarn": "1.22.22"
   },
   "resolutions": {

test/commands/lightning/dev/componentLocalPreview.nut.ts

@@ -9,7 +9,7 @@ import path from 'node:path';
 import fs from 'node:fs';
 import { expect } from 'chai';
 import { TestSession } from '@salesforce/cli-plugins-testkit';
-import dotenv from 'dotenv';
+import * as dotenv from 'dotenv';
 import axios from 'axios';
 import { toKebabCase } from './helpers/utils.js';
 import { createSfdxProject, createLwcComponent } from './helpers/projectSetup.js';

test/tsconfig.json

@@ -1,6 +1,6 @@
 {
   "extends": "@salesforce/dev-config/tsconfig-test-strict-esm",
-  "include": ["./**/*.ts"],
+  "include": ["./**/*.ts", "./**/*.nut.ts"],
   "compilerOptions": {
     "skipLibCheck": true
   }