I would like to point out that my sent transaction appeared in the exchange interface only after two ₿ confirmations, even though I had refreshed the page during the process.
That's intended behaviour, not a display bug — the order page shows the deposit once it has the confirmations it needs, so refreshing earlier won't surface it. Thanks for the report on the swap itself.
It's like half of them claim dark themes are easier on the eye while other half claim the opposite... This is why UI designers include the choice to switch between the two.
I assumed as much but since the option is disabled the "information icon" is also disabled (at least it is on my browser). So hovering over it doesn't open the tool-tip.
On the icon: that's by design — when the mode is off, the whole card including the icon is inactive. The tooltip describes how the mode works, so there isn't much use for it while the mode isn't selectable.
On the theme: the reasoning makes sense, and we're not dismissing it — it's a question of order. First we get the technical side fully dialed in, then we expand the coin list, and design work like this comes after that. So not now, but it's not off the table either.