fix: replace require('fs') with ESM import in build e2e spec

[Copilot]

The cleanDist() helpers in build.command.e2e-spec.ts used require('fs') — unavailable in ESM modules — causing runtime failures since the test file runs under "type": "module".

Changes

• test/e2e/build.command.e2e-spec.ts: Added top-level import * as fs from 'fs' and removed the inline require('fs') calls from both cleanDist() functions.

// Before
function cleanDist() {
  const fs = require('fs'); // ❌ not available in ESM
  fs.rmSync(path.join(appPath, 'dist'), { recursive: true, force: true });
}

// After
import * as fs from 'fs'; // ✅ top-level ESM import

function cleanDist() {
  fs.rmSync(path.join(appPath, 'dist'), { recursive: true, force: true });
}

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