* fix(frontend): keep additional_kwargs on the optimistic bubble through an upload
When a send carried files, the upload-complete update replaced the
optimistic human message's additional_kwargs with only the uploaded
files. Quote and conversation reference chips vanished until the server
echoed the message, and project attachments staged with the send were
missing from the bubble both while uploading and after. The submitted
message was always intact.
The optimistic copy (before and after the upload) and the submit now
build additional_kwargs through one helper,
buildHumanMessageAdditionalKwargs, and share a single uploaded-files
value, so the bubble always matches what was sent.
* docs(changelog): reference #5982
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
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