feat(projects): add open in new tab button for projects

[nino-chavez]

Summary

• Added ExternalLink icon button that appears on project card hover
• Opens project editor in new browser tab
• Uses <button> with window.open() to avoid nested <a> tags (since card is wrapped in Next.js Link)

Related Issue

Fixes #644

Test plan

• Hover over project card - external link icon appears
• Click icon - project opens in new tab
• No console errors about nested anchors
• Playwright E2E test included

🤖 Generated with Claude Code

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Name	Link
🔨 Latest commit	a005087

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