separate the sensitive flag from the spoiler text (what it's called in the API)

that way you can have summaries, and posts with a content warning when you're not sure what to put

it seems silly to mark "long post" as sensitive

@Elizafox Um ... unless I'm reading you wrong, isn't that how it used to be a year ago?

@KS I don't remember, this is how it's been since I started using Masto