watch does not load style assets if the initial build fails

[luxalpa]

1. Run cargo leptos watch in your project while there's some code error
2. Fix that error
3. The app that now loads doesn't have any CSS until you restart the watch.

This has been a surprisingly annoying issue for me. I think it's caused by

cargo-leptos/src/command/build.rs

Lines 38 to 50 in d36a187

	if !compile::front(proj, &changes).await.await??.is_success() {
	return Ok(false);
	}
	if !compile::assets(proj, &changes, true)
	.await
	.await??
	.is_success()
	{
	return Ok(false);
	}
	if !compile::style(proj, &changes).await.await??.is_success() {
	return Ok(false);
	}

where it just returns and doesn't load any assets if the build fails. Further style changes are only added iteratively.

I assume we can just run the compile::assets and compile::styles functions (and possibly others) regardless of success or failure. Maybe I'll drop a PR for this later.