[jonomacd]

Again I don't know if it is the best for their current use case but you could probably make something that is quite elegant in htmx.

There are a few actions that are exclusively client side, like opening a context menu, that I'd use a "sprinkle of JavaScript". There is a recently added htmx attribute "hx-on" that might work well for those cases.

I'd also not discount doing a round trip for some of that. Those GET requests can be very fast and will be cached. Given the poor performance of many SPA's a quick, cache-able GET request might look pretty good.