- Backend: ChatMessageRequest accepts upload_ids, endpoint fetches
images from S3, base64-encodes them, passes to Claude as multimodal
content blocks (vision API)
- Backend: add download_file() to storage_service for fetching from S3
- Frontend: handleSend collects completed upload IDs from pendingUploads
and includes them in the sendChatMessage API call
- Frontend: prefill handler passes upload IDs from dashboard nav state
- Enables paste-screenshot → AI-sees-it flow end-to-end
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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