fix: default config validation error and extras

[jescalada]

Fixes #654, #1122.

Also fixes a critical dependency vulnerability.

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	9305165
🔍 Latest deploy log	https://app.netlify.com/projects/endearing-brigadeiros-63f9d0/deploys/688a27c96eb24e0008228919

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.25%. Comparing base (8e38bd7) to head (9305165).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1124      +/-   ##
==========================================
- Coverage   80.28%   80.25%   -0.03%     
==========================================
  Files          59       59              
  Lines        2475     2472       -3     
  Branches      289      288       -1     
==========================================
- Hits         1987     1984       -3     
  Misses        453      453              
  Partials       35       35              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[coopernetes]

LGTM 👍