[FRONTEND] Tests — GalleryImage component

[yrska]

🎯 Acceptance Criteria

• Renders an with the correct src and alt attributes
• Renders the skeleton placeholder before the image loads (simulate by not firing onLoad)
• Transitions to the real image once onLoad fires
• Renders the error fallback when onError fires
• Uses React Testing Library and Vitest, Test file is co-located at GalleryImage.test.tsx

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📊 Definition of Done (DoD)

• Acceptance criteria met
• Agreed tests written
• Agreed documentation in GitHub wiki
• PR reviewed

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🔗 Dependencies

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📚 Additional Context