fix(processor): resolve metadata extraction failure on Vercel

[moshams272]

Summary

The Edit this page link works locally well, but in Vercel it doesn't. After debugging, I found in the file plugins/processor/source.mjs that:

export const applySourceMetadata = (
  project,
  { libDir = './webpack/lib' } = {}
) => {
  const absoluteLibDir = resolve(libDir);
  if (!existsSync(absoluteLibDir) || !statSync(absoluteLibDir).isDirectory()) {
    return;
  }
...}

The existsSync function works well locally, as there is a webpack repo in the root path, but we don't have it in vercel.

This PR uses the cached repo instead of that one in the root path.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
webpack-doc-kit	Ready	Preview, Comment	Jul 13, 2026 7:45am