Introduce a document identity key combining type and id for consistent
identification across document operations, including selection, drag-and-drop,
and folder management. Refactor drag item structures to use identity objects
instead of plain ids, preventing cross-type collisions and improving merge
accuracy. Update Dexie recently opened map to use identity keys. Enhance
document size formatting for small files and improve error feedback in the
uploader. Clean up redundant props and standardize icon SVG handling.
dca1a9b35d