Converts everything to typescript, adding `@ts-expect-error`s where
necessary. Also makes some progress converting elements to use
decorators, but we're not fully there yet — I think it'll make sense to
continue to do that in future PRs, rather than doing it all in one go,
just so that we can keep up with the dev branch.
add ts-lit-plugin and eslint-typescript
disable no-invalid-css rule
fix a bunch of errors raised by eslint and typescript
run prettier & eslint on the remaining files
remove unused imports
split coll-index into index and info components...
and rename "coll" -> "item" for these.
also includes some fixes for previously-undocumented properties used on
non-ts elements.
extract labeled fields into separate component...
and make a few type improvements too
swap custom copy button for shoelace one
rename a few more missed things
Emma Segal-Grossman