When selling at a station, not all items in your cargo hold are visible—only the ones that the station is willing to buy. We need to explain this to the user so they are not confused about where all their cargo is.
Example: I look a damaged recoilless but when I go to sell it, it doesn't show up in the list. What happened to it?
We could solve this by showing tabs on the selling screen. The first tab shows all items that the station wants to buy. The second tab shows all other items in your cargo hold. If the list is empty, we should have appropriate text (e.g., "You don't have anything the station wants to buy", instead of "There are no items here.").
Alternatively, we show all cargo items in the list. The ones the station wants to buy are sorted to the top. The remainder are grayed out.