Replace dual HTML5/Touch backend logic with a single TouchBackend configured to
handle both mouse and touch events, ensuring consistent drag-and-drop behavior
across all devices. Introduce a custom DocumentDragLayer to render drag previews
universally, as the touch backend does not provide a native drag image.
Update document tile, gallery, and list views to suppress native long-press
previews on iOS and prevent accidental document opening after drag actions.
Revise drag-and-drop test helpers to simulate pointer gestures compatible with
the new backend, improving reliability of automated tests.
Revamp the document list experience by introducing a Finder-style window
interface with multiple views (icons, list, columns, gallery) and a new
sidebar filter system. Remove legacy folder and list item components in
favor of modular, windowed views. Integrate react-dnd-touch-backend and
custom DnD context for improved drag-and-drop, including mobile support.
Update uploader and dialog styles for consistency. Extend document types
to support new view modes, icon sizing, and sidebar state.
