chore: Silence Yarn peer dependency warnings

[rekmarks]

I set out to fix our peer dependency warnings, but ended up silencing then. This is not great for a permanent state of affairs, however I'm curious if it will cause Dependabot to work.

Also adds a missing dev dependency to kernel-ui.

---

Note

Reduces noise from Yarn and aligns dev/test deps.

• Update .yarnrc.yml to discard YN0060 and YN0086 logs; minor spec quoting tweak
• Add @testing-library/dom to packages/kernel-ui/package.json devDependencies and to .depcheckrc.yml ignores to quiet peer-dep checks
• Regenerate yarn.lock to include @testing-library/dom and related transitive entries (e.g., aria-query, dequal, picocolors key normalization)

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​testing-library/​dom@​10.4.1

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