Artifact quickstart for 'document' now looks up a real matching document type
When the Artifact tool's quickstart flow handles a request for a 'document', it now goes through the same type-lookup process already used for 'slides' and 'design': it looks up a matching artifact type, lists candidates if the request is ambiguous, and handles the case where no type catalog is available. Previously, 'document' requests were hard-coded to always fall back to a first-party Docs connector or a generic quickstart.
This makes document quickstarts behave consistently with slides and design, correctly picking a specific document type when one is available instead of always falling back to a generic path.