fix(cli): show actionable error when package.json is missing "type": "module"

[krismuhi]

Summary

• Bug: running mobilewright test with a CJS package.json (missing "type": "module") dumps a raw Node.js ERR_REQUIRE_ESM stack trace with no hint about the fix.
• Fix: catch ERR_REQUIRE_ESM in the config-loading step and print a clear message telling the user exactly what to add to their package.json.
• Affects: any user who scaffolds a new project without "type": "module" or copies config from a CJS project.

Error before this fix

Error [ERR_REQUIRE_ESM]: require() of ES Module .../node_modules/mobilewright/dist/index.js
from .../mobilewright.config.ts not supported.
Instead change the require of index.js in .../mobilewright.config.ts to a dynamic import()
which is available in all CommonJS modules.
    at Object.newLoader2 [as .js] (.../playwright/lib/third_party/pirates.js:52:22)
    ...

Error after this fix

Error: Could not load your mobilewright config.

Your config file imports an ES Module (e.g. mobilewright), but your package.json
is missing "type": "module". Node's CommonJS loader cannot require() ES Modules.

Fix: add the following to your package.json:

  "type": "module"

Then re-run: npx mobilewright test

Test plan

• Verify existing tests pass (npm test — 147 passed, 1 skipped)
• Manually test with a project missing "type": "module" to confirm the friendly error is shown
• Verify that non-ERR_REQUIRE_ESM errors are still re-thrown as before