keep new screenshots as binary Blobs in IndexedDB instead of base64 text
upload original bytes as multipart form data online and in background delivery
retain delivery compatibility for legacy base64 queue records
preserve MIME/signature, 2 MiB, idempotency, checkpoint, and claim-fencing controls
Verification
RED observed for multipart API, Blob serialization/storage, multipart online/background transport, and tighter binary request boundary
Focused: 118 passed
Full suite: 979 passed
Closes #491
## What changed
- keep new screenshots as binary Blobs in IndexedDB instead of base64 text
- upload original bytes as multipart form data online and in background delivery
- retain delivery compatibility for legacy base64 queue records
- preserve MIME/signature, 2 MiB, idempotency, checkpoint, and claim-fencing controls
## Verification
- RED observed for multipart API, Blob serialization/storage, multipart online/background transport, and tighter binary request boundary
- Focused: 118 passed
- Full suite: 979 passed
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Closes #491
What changed
Verification