Consolidates duplicated GET/PUT/notification-channel logic across
DownloadService/ShareUploadService/SyncEngine into shared Kotlin helpers,
gives upload/download real batch queueing instead of dropping a second
concurrent batch, and dedupes repeated Dart channel-argument boilerplate.
Replaces the 2300+ line ServerProvider god object with ten focused
ChangeNotifiers (SessionController, SettingsController, FilesController,
PhotosController, FavoritesController, TrashController, SharesController,
RecentController, SyncStatusController, PickController) plus ItemOperations,
a plain coordinator for cross-domain item mutations - fixing the coupling
where device-sync status, per-tab data, and global UI prefs all lived in
one object. Updates every view/widget call site accordingly and refreshes
the architecture/server/standards/styling docs to match.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
getItemIcon/getIconColor/ItemThumbnail move out of files_view.dart into
widgets/item_icon.dart so other screens (the share-upload destination
picker, in a follow-up commit) can reuse the same file/folder icon
treatment instead of re-deriving it.
The Files controls bar's "this scrolls" hint is now a one-shot nudge
(scrolls right then back once on first appearance) instead of a
persistent chevron badge or edge fade - both prior attempts blended into
the row's sparse icon content too easily to actually register.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>