[FRONTEND] Tests — GalleryGrid component

[yrska]

🎯 Acceptance Criteria

• Renders the correct number of GalleryImage children for a given images prop
• Renders the "No images yet" empty state when images={[]}
• Does not render the empty state when images are present
• Grid container has the expected responsive Tailwind class names (sm:grid-cols-2 md:grid-cols-3 lg:grid-cols-4)
• Snapshot test for the default rendered state

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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