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

[Copilot]

test/e2e/build.command.e2e-spec.ts runs under ESM ("type": "module"), where require is not defined. Both cleanDist() functions used const fs = require('fs') inline, causing them to throw at runtime.

Changes

• Added top-level import * as fs from 'fs' to the test file
• Removed inline const fs = require('fs') from both cleanDist() functions

+ import * as fs from 'fs';

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

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