or4acle/futaba ? reverse-engineered prompt

Build me a simple gallery site called FutabaGallery that shows a collection of Futaba images in a clean, browsable way.

I want it to feel like a fan gallery, with a nice landing page, a grid of photos, and an easy way to open images bigger so people can look through them comfortably on desktop and mobile. Use the existing images and data file if there is one, and make the page load fast and look polished. Please also make it work like a normal installable site, with the right icons and manifest so it can be saved on a phone home screen.

Keep it straightforward and lightweight, since this is mostly about showing the pictures well. If you need to look up current browser friendly gallery patterns or image handling details, go ahead and check online docs.