fix: allow dots in markdown link text

[SSDWGG]

Summary

• loosen the markdown link input rule so link text can contain dots
• add a regression test for [something.cloud](https://something.cloud/page)

Fixes #7872

Tests

• npx vitest run src/tests/marks/Link.spec.js

[mejo-]

Thanks @SSDWGG, much appreciated. I slightly adjusted your commit and added a Playwright test to have end-to-end testing of the input rule.

[mejo-]

/backport to stable34

[mejo-]

/backport to stable33

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[github-actions]

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