amal66 puts a traffic cop on bulk document uploads

Across the project assistant, tabular review and add-documents screens, amal66 is replacing the current upload free-for-all with a measured queue: only two files upload at once.

• Successful files remain available even if others fail.
• A dismissible warning names the files that did not upload, so users can retry them manually.
• Dragged-and-dropped unsupported file types are stopped before they reach the service.

The trade-off is deliberate: a large batch may take longer, but it is less likely to overwhelm the upload service or leave staff guessing what happened. There is no automatic retry, avoiding an extra burst of traffic when a service is already under pressure.