fix(types): update Markdown.test.tsx to use getAttribute

[jdhoffa]

• Replace direct property access (.target, .rel, etc.) with getAttribute()
• Add nullish coalescing for unset attributes that return null
• Update href test to use toMatch for more flexible assertion
• Clean up test formatting and remove unnecessary object wrapping

Relates to #514

[github-actions]

Expected version change and release notes:

1.5.0-dev.19 (v1.5.0-dev.18...fix-ts_errors_markdown_test ) (2025-11-05T14:39 UTC)

Fixes

• update Markdown test to use getAttribute (e81a437)

[Copilot]

Pull Request Overview

This PR standardizes test assertions in the Markdown component tests by consistently using getAttribute() instead of direct DOM property access.

• Refactored all DOM property assertions (e.g., a.target, a.rel, a.href) to use getAttribute() method
• Added nullish coalescing (?? "") for assertions expecting empty strings when attributes are absent
• Changed assertions to use regex matching where appropriate (e.g., toMatch(/#section$/))

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[github-actions]

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