Implement unified drag system that supports both internal node moves
and external file uploads with consistent UI feedback. Uses native
HTML5 drag API with shared visual states (isDragOver, isBlinking,
DragActionTooltip showing 'Move to' or 'Upload to').
- Add constants.ts with ROOT_ID, CONTEXT_MENU_TYPE, NODE_MENU_TYPE
- Add root utilities to tree-utils.ts (isRootId, toApiParentId, etc.)
- Replace '__root__' with ROOT_ID for consistent root identifier
- Replace inline 'blank'/'root' strings with constants
- Use NodeMenuType for type-safe menu type props
- Remove duplicate ContextMenuType from types.ts, use from constants.ts
Split use-file-operations.ts (248 lines) into smaller focused hooks:
- use-create-operations.ts for file/folder creation and upload
- use-modify-operations.ts for rename and delete operations
- use-file-operations.ts now serves as orchestrator maintaining backward compatibility
Extract TreeNodeIcon component from tree-node.tsx for cleaner separation of concerns.
Add brief comments to drag hooks explaining their purpose and relationships.
Use Promise.all for concurrent file uploads instead of sequential
processing, improving upload performance for multiple files. Also
add isFileDrag check to handleFolderDragOver for consistency with
other drag handlers.
Enable users to drag files from their system directly into the file tree
to upload them. Files can be dropped on the tree container (uploads to root)
or on specific folders. Hovering over a closed folder for 2 seconds auto-
expands it. Uses Zustand for drag state management instead of React Context
for better performance.
