feat(core): enhance config validation

[hanna-skryl]

Fixes #704

This PR introduces zod-validation-error as a new project dependency to make Zod validation errors more compact and readable. Due to the limited scope of the issue being resolved, zod-validation-error is currently used only to validate coreConfigSchema.

Formatted config validation errors

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit c8d85d5 with source commit 9099514.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
SEO	🟡 61	🟡 85
Performance	🟡 54	🟡 51
Updates	🟡 74	🟡 75
Security	🟡 82	🟡 81
Code coverage	🟢 90	🟢 90
Accessibility	🟢 91	🟢 91	–
Best Practices	🟢 100	🟢 100	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–

👍 2 groups improved, 👎 3 groups regressed, 👍 2 audits improved, 👎 10 audits regressed, 13 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	SEO	🟡 61	🟡 85
Lighthouse	Performance	🟡 54	🟡 51
JS Packages	NPM outdated dependencies	🟡 74	🟡 75
JS Packages	NPM audit	🟡 82	🟡 81
Code coverage	Code coverage metrics	🟢 90	🟢 90

12 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Page isn’t blocked from indexing	🟥 failed	🟩 passed
Lighthouse	robots.txt is valid	🟩 passed	🟥 failed
Lighthouse	Speed Index	🟨 5.7 s	🟥 6.7 s
Lighthouse	First Contentful Paint	🟨 2.9 s	🟥 3.2 s
Lighthouse	Time to Interactive	🟥 13.3 s	🟥 16.2 s
Lighthouse	Largest Contentful Paint	🟨 3.2 s	🟨 3.2 s
JS Packages	Vulnerabilities for NPM dev dependencies.	🟥 12 vulnerabilities (6 high, 4 moderate, 2 low)	🟥 13 vulnerabilities (6 high, 4 moderate, 3 low)
Lighthouse	Total Blocking Time	🟥 3,530 ms	🟥 8,410 ms
JS Packages	Outdated NPM prod dependencies.	🟨 9 outdated package versions (5 major, 2 minor, 2 patch)	🟨 10 outdated package versions (5 major, 4 minor, 1 patch)
Code coverage	Function coverage	🟩 92.9 %	🟩 92.8 %
Code coverage	Line coverage	🟩 90.6 %	🟩 90.6 %
Code coverage	Branch coverage	🟨 85.2 %	🟨 85.2 %
Lighthouse	Minimizes main-thread work	🟥 13.4 s	🟥 22.3 s
Lighthouse	JavaScript execution time	🟥 6.3 s	🟥 12.5 s
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,820 KiB	🟩 Total size was 1,817 KiB
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Max Potential First Input Delay	🟥 1,600 ms	🟥 2,860 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 28 resources found	🟨 28 resources found
Lighthouse	Server Backend Latencies	🟩 330 ms	🟩 80 ms
Lighthouse	Initial server response time was short	🟩 Root document took 520 ms	🟩 Root document took 430 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 1,120 ms	🟥 Potential savings of 1,050 ms
Lighthouse	Network Round Trip Times	🟩 80 ms	🟩 90 ms
Lighthouse	Avoid large layout shifts	🟩 0	🟩 1 layout shift found
Lighthouse	Avoids an excessive DOM size	🟥 2,163 elements	🟥 2,162 elements
Lighthouse	Cumulative Layout Shift	🟩 0	🟩 0.001

483 other audits are unchanged.

[matejchalk]

I like how the error messages are formatted, good job 👍