The direct competitor to Swift is most likely Kotlin and I bet it'll win out as a cross platform solution of choice in a couple of years as KMP stabilizes.

Is Dart still a thing? Genuinely interested.

It absolutely is and its a pleasant language to work with. Although it is in a kinda-symbiotic relationship with Flutter, I've found myself using it for small scripts and cli tools instead of Python because of its strong+static typing with null safety.

Relevant to the topic, Dart (and Flutter) supports targeting wasm.

Yup. It got it's second life because Flutter adopted it as it's language.

It was pretty dead for a few years (despite what the googlers will tell you...)

Not only a thing but is growing at a crazy rate. Easily my favourite language out there for the last few years.