Design a modern and clean icon symbolizing a Stage Preview Development Environment. The icon should feature elements like an eye or preview pane, indicating a final review, alongside a layered server stack or cloud symbol, representing the staging environment. Include a magnifying glass or progress bar, suggesting detailed inspection before production. Use a neutral or dark background with highlights in soft blues, greens, and yellows to convey the preview phase. The design should feel polished and user-friendly, representing the final check before full deployment.