feat(MaintainerCard): add 'linkedIn' icon to 'MaintainerSocialIcons'

[sukvvon]

Add linkedIn SVG icon to MaintainerSocialIcons so that maintainers with a linkedIn social link have their icon rendered correctly.

Summary by CodeRabbit

• New Features
  • Added LinkedIn support for maintainer profiles: maintainer cards now display a LinkedIn icon and link when a LinkedIn URL is provided, alongside existing social links (Twitter, Bluesky, Website, GitHub). This improves discoverability of maintainers' professional profiles from their cards without changing existing social link behavior.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1e47a4c9-181f-4f37-b01e-4f5a264535de

📥 Commits

Reviewing files that changed from the base of the PR and between 29ef2a9 and 8ce5441.

📒 Files selected for processing (1)

• src/components/MaintainerCard.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• src/components/MaintainerCard.tsx

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📝 Walkthrough

Walkthrough

Added a linkedIn SVG icon entry to the MaintainerSocialIcons map in src/components/MaintainerCard.tsx; when a maintainer's social object includes linkedIn, the component now renders a LinkedIn social link alongside existing icons.

Changes

Cohort / File(s)	Summary
LinkedIn Icon Addition src/components/MaintainerCard.tsx	Added a linkedIn entry to the MaintainerSocialIcons mapping and updated rendering so MaintainerSocialLinks displays a LinkedIn icon/link when maintainer.social.linkedIn is present.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 I hopped through code with nimble paws,
A shiny LinkedIn found its cause,
Icons lined up in tidy rows,
Now maintainers strike new bows,
Network sprouts where the rabbit goes.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a LinkedIn icon to the MaintainerSocialIcons component, which matches the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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