Last parity gap from the VanillaJS → Svelte migration (issue #500),
frontend-only — the backend endpoints already exist.
- Drag-out download: onItemDragStart now also sets the DataTransfer
`DownloadURL` type, so dragging a row/selection onto the OS desktop
downloads it — a single file directly (GET /api/files/{id}), a folder as a
zip (GET /api/folders/{id}/download?format=zip), and a multi-selection as
one server-zipped archive via the GET twin GET /api/batch/download
(DownloadURL can only point at a GET URL). The zip name is shared with the
in-app batch download via a new batchZipName() helper.
- Folder drag-drop upload: onDrop now walks dropped directory trees with
webkitGetAsEntry/createReader into {file, relativePath} rows and recreates
the tree server-side, instead of dropping only a folder's top-level files.
The recursive-upload core is extracted into uploadTree() and shared with the
folder picker (onUploadFolder), so both paths behave identically. Plain
multi-file drops keep the existing flat fast-path.
Stacked on #502 (shares onItemDragStart). Frontend gate green (svelte-check
0/0, eslint, stylelint, prettier) + 47 Vitest.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
DioCrafts
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