Workspace package subpath consumers may need a targeted build before Playwright

What happened

After slate-browser moved into packages/ and gained real subpath exports, repo Playwright tests started importing:

• slate-browser/playwright

That import resolved through the package exports map to built files under dist/playwright/....

The package itself was valid. The tests still failed, because those built subpath files did not exist yet.

What fixed it

Do not force a full repo build for one package-shaped browser test.

Instead:

1. add a targeted build command for the package
2. run that command before the Playwright slices that import the built subpath

In .tmp/slate-v2 that became:

• yarn build:slate-browser
• then yarn test:slate-browser:e2e
• yarn test:slate-browser:ime
• yarn test:slate-browser:clipboard
• yarn test:slate-browser:anchors

Reusable rule

If repo-local Playwright tests consume a workspace package through its public subpath exports, and those exports point at dist, then the package must be built before those tests run.

Do not “solve” this by falling back to local relative helpers again.

Build the package, not the whole repo, unless the package really depends on a broader build graph.