On user profiles, makes the activity, files, and listenbrainz sections collapsible. On mobile, they are collapsed by default to avoid the "stuck popover" issue and reduce the amount of scrolling needed to reach the user's notes. Nothing is changed on desktop layouts.
Additionally, performs some basic cleanup to reduce lint / TS errors in these files. Only Sharkey lines are changed, so there should be no impact to future merges.
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