This makes the background for the "wave-theme-dark" theme transparent.
The light theme is still opaque because otherwise it will look somewhat
dark.
This also suppresses TypeScript/JavaScript import errors in the default
linter, since we don't have support for project directories.
This also reworks the useWidth and useHeight hooks to use the
useResizeObserver hook, which limits the number of ResizeObserver
instances floating around, thereby improving performance