Fix Trash/Shares list perf and live-update the Files sort/filter sheet

Trash and Shares built their mobile lists eagerly via NooGroupedList's
own Column instead of a lazy sliver, so an account with hundreds of
items made those tabs laggy - both now use a SliverList/
SliverChildBuilderDelegate instead, matching Files' own lazy list,
while keeping the same one-continuous-card look via per-row corner
rounding and a 1px divider.

FilesControlsRow's sort/filter sheets also had a live-update bug: since
showNooSheet's children are built once up front, tapping a row inside
the open sheet updated the controller but the already-built
checkmarks/toggles stayed stale until the sheet was closed and
reopened. Wrapping each sheet's content in a ListenableBuilder fixes
that.

Also adds NooSelectionBar to styling.md's widget inventory table.

.claude/context/styling.md

@@ -78,7 +78,7 @@ Catalog:
 | Folder | Components |
 |---|---|
 | `core/` | `NooButton`, `NooFab`, `NooChip`, `NooSegmentedControl`, `NooToggle`, `NooSearchField`, `NooAvatar`, `NooBadge`, `NooProgressBar` |
-| `lists/` | `NooGroupedList`, `NooSettingsRow`, `NooTabOrderRow`, `NooBanner`, `NooSummaryCard` |
+| `lists/` | `NooGroupedList`, `NooSettingsRow`, `NooTabOrderRow`, `NooBanner`, `NooSummaryCard`, `NooSelectionBar` |
 | `files/` | `NooFileKind` (spec §1.2 tiles; `NooFileKind.from(name:, mimeType:, isDirectory:)`), `NooFileTile`, `NooStatusIcon`/`NooSyncStatus`, `NooFileRow` (mobile 64px), `NooFileTableHeader`/`NooFileTableRow` (desktop), `NooSwipeAction` |
 | `media/` | `NooGridCard`, `NooPhotoTile` (video badge, selection), `NooPhotoGroupHeader`/`NooPhotoGrid` (sliver, or `.box`), `NooActivityItem`, `NooStatCard` |
 | `nav/` | `NooBottomBar`, `NooTopBar` (a `PreferredSizeWidget`) with `NooTopBarButton`/`NooTopBarBack`, `NooDrawer` with its `Account`/`Storage`/`Item`/`Link` parts, `NooSidebar` with `NooSidebarItem`/`Divider`/`Account`/`Storage`, `NooToolbar` |