grab-conversation-files asked listBotFiles for the top level only, and a
bot saves into folders (reports/, seo/coderank/, tmp/...). The page
therefore carried none of the files a reply named, so every [file:ID]
chip rendered as dead plain text and the files could not be opened at
all: the bot had done the work and the user had no way to reach it.
The props now take the whole tree, and a chip that still isn't among
them (a message older than the page's first page of files) fetches its
one file by id, cached per id so a deleted one doesn't refetch on every
render.
tben
de863618ba