Replaces the legacy /api/uploads call in RegisterPage with the tus-based
transferStore path. Extends Transfer to persist the server-assigned
filename (not just attachmentId) since downstream consumers store
attachment.filename on the user/space record.
- transferStore: rename setAttachmentId -> setAttachmentRef(id, attachmentId, filename)
and add attachmentFilename field to Transfer
- both startUpload + resumeUpload onSuccess paths now record filename
- new utils/waitForTransfer.ts: waitForTransferAttachment(transferId)
returns {attachmentId, filename}, with immediate-terminal handling
- RegisterPage: silent (tray:false) upload via transferStore, awaits
the helper, passes the server filename to api.users.update
Jannis Braun
727c51f659