feat: make repository titles clickable links to GitHub (closes #60)

[Ai-chan-0411]

Summary

• Wraps repository name text in <a> tags pointing to https://github.com/{username}/{reponame}
• Links open in a new tab with target="_blank" and rel="noopener noreferrer" for security
• Falls back gracefully when repo.name is undefined (no link rendered)

Changes

• components/top-list.tsx: Added optional titleHref prop to the cardDetails helper; when provided, renders the title as an anchor link instead of plain text. Passes https://github.com/${user.username}/${repo.name} for each top repository card.

Test plan

• Compare two GitHub users and verify repository names in "Top Repositories" section are clickable links
• Confirm links open in a new tab pointing to the correct GitHub repo URL
• Verify that repositories with no name still render as plain text (no broken link)

Fixes #60

🤖 Generated with Claude Code

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