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` |

lib/views/shares_view.dart

@@ -11,7 +11,6 @@ import '../widgets/noo/core/noo_segmented_control.dart';
 import '../widgets/noo/files/noo_file_kind.dart';
 import '../widgets/noo/files/noo_file_row.dart';
 import '../widgets/noo/files/noo_file_table.dart';
-import '../widgets/noo/lists/noo_grouped_list.dart';
 import '../widgets/noo/noo_layout.dart';
 import '../widgets/tabs/tab_state_slivers.dart';
 
@@ -162,14 +161,20 @@ class _SharesViewState extends State<SharesView> {
     c.setSharedWithMe(scope == _ShareScope.withYou);
   }
 
+  // A lazily-built `SliverList`, not `NooGroupedList` (its own `Column`
+  // isn't lazy - see files_view.dart's `_buildMobileRow` doc comment, and
+  // trash_view.dart's `_buildMobileList`, which had the same bug: a heavy
+  // account's full share list built eagerly up front). Each row still
+  // reads as one continuous radius-20 card via per-row corner rounding +
+  // a 1px `line` divider.
   Widget _buildMobileList(BuildContext context, List<NextcloudShare> shares) {
+    final colors = context.nooColors;
     return SliverPadding(
       padding: const EdgeInsets.symmetric(horizontal: NooSpace.sm),
-      sliver: SliverToBoxAdapter(
-        child: NooGroupedList(
-          children: [
-            for (final share in shares)
-              NooFileRow(
+      sliver: SliverList(
+        delegate: SliverChildBuilderDelegate((context, index) {
+          final share = shares[index];
+          final row = NooFileRow(
             kind: NooFileKind.from(name: share.name, isDirectory: share.isFolder),
             name: share.name,
             meta: '${share.ownerDisplayName} · ${_permissionLabel(share.permissions)}',
@@ -177,9 +182,26 @@ class _SharesViewState extends State<SharesView> {
             onTap: share.isFolder ? () => _openFolder(context, share) : null,
             trailing: Icon(_shareTypeIcon(share.shareType), size: 16),
             onMore: () => _confirmUnshare(context, share),
+          );
+          final isFirst = index == 0;
+          final isLast = index == shares.length - 1;
+          return Column(
+            children: [
+              ClipRRect(
+                borderRadius: BorderRadius.vertical(
+                  top: isFirst
+                      ? const Radius.circular(NooRadii.card)
+                      : Radius.zero,
+                  bottom: isLast
+                      ? const Radius.circular(NooRadii.card)
+                      : Radius.zero,
                 ),
+                child: row,
+              ),
+              if (!isLast) Container(height: 1, color: colors.line),
             ],
-        ),
+          );
+        }, childCount: shares.length),
       ),
     );
   }

lib/views/trash_view.dart

@@ -11,7 +11,6 @@ import '../widgets/noo/files/noo_file_row.dart';
 import '../widgets/noo/files/noo_file_table.dart';
 import '../widgets/noo/files/noo_file_tile.dart';
 import '../widgets/noo/lists/noo_banner.dart';
-import '../widgets/noo/lists/noo_grouped_list.dart';
 import '../widgets/noo/noo_layout.dart';
 import '../widgets/tabs/tab_location.dart';
 import '../widgets/tabs/tab_state_slivers.dart';
@@ -103,14 +102,20 @@ class _TrashViewState extends State<TrashView> {
     );
   }
 
+  // A lazily-built `SliverList`, not `NooGroupedList` (its own `Column`
+  // isn't lazy - see files_view.dart's `_buildMobileRow` doc comment for
+  // the same reasoning): Trash can hold hundreds of items, and building
+  // every row eagerly up front is what made this tab laggy. Each row still
+  // reads as one continuous radius-20 card via per-row corner rounding +
+  // a 1px `line` divider, matching `NooGroupedList`'s look.
   Widget _buildMobileList(BuildContext context, List<NextcloudItem> trash) {
+    final colors = context.nooColors;
     return SliverPadding(
       padding: const EdgeInsets.symmetric(horizontal: NooSpace.sm),
-      sliver: SliverToBoxAdapter(
-        child: NooGroupedList(
-          children: [
-            for (final item in trash)
-              NooFileRow(
+      sliver: SliverList(
+        delegate: SliverChildBuilderDelegate((context, index) {
+          final item = trash[index];
+          final row = NooFileRow(
             kind: NooFileKind.from(
               name: item.name,
               mimeType: item.mimeType,
@@ -132,9 +137,26 @@ class _TrashViewState extends State<TrashView> {
               ),
             ),
             onMore: () => _confirmDeleteForever(context, item),
+          );
+          final isFirst = index == 0;
+          final isLast = index == trash.length - 1;
+          return Column(
+            children: [
+              ClipRRect(
+                borderRadius: BorderRadius.vertical(
+                  top: isFirst
+                      ? const Radius.circular(NooRadii.card)
+                      : Radius.zero,
+                  bottom: isLast
+                      ? const Radius.circular(NooRadii.card)
+                      : Radius.zero,
                 ),
+                child: row,
+              ),
+              if (!isLast) Container(height: 1, color: colors.line),
             ],
-        ),
+          );
+        }, childCount: trash.length),
       ),
     );
   }

lib/widgets/files_controls_row.dart

@@ -92,6 +92,18 @@ class FilesControlsRow extends StatelessWidget {
   void _showSortSheet(BuildContext context, FilesController files) {
     showNooSheet(
       context,
+      children: [
+        // `showNooSheet`'s `children` are built once, up front - a bare
+        // checkmark/value here would freeze at whatever it was when the
+        // sheet opened, since tapping a row calls `files.set...` and
+        // notifies the controller, not this already-built widget tree.
+        // `ListenableBuilder` re-runs its `builder` on every
+        // `FilesController.notifyListeners()` instead, so the selection
+        // updates live - see the identical fix in `_showFilterSheet`.
+        ListenableBuilder(
+          listenable: files,
+          builder: (context, _) => Column(
+            mainAxisSize: MainAxisSize.min,
             children: [
               NooSegmentedControl<bool>(
                 fill: true,
@@ -106,6 +118,7 @@ class FilesControlsRow extends StatelessWidget {
                   NooSegmentOption(value: false, icon: LucideIcons.arrowDown, label: 'Descending'),
                 ],
               ),
+              const SizedBox(height: 22),
               NooGroupedList(
                 children: [
                   for (final field in FileSortField.values)
@@ -122,12 +135,23 @@ class FilesControlsRow extends StatelessWidget {
                 ],
               ),
             ],
+          ),
+        ),
+      ],
     );
   }
 
   void _showFilterSheet(BuildContext context, FilesController files) {
     showNooSheet(
       context,
+      children: [
+        // See `_showSortSheet`'s comment: without this, none of the
+        // checkmarks/toggles below would move until the sheet is closed
+        // and reopened.
+        ListenableBuilder(
+          listenable: files,
+          builder: (context, _) => Column(
+            mainAxisSize: MainAxisSize.min,
             children: [
               NooGroupedList(
                 label: 'Show',
@@ -155,6 +179,7 @@ class FilesControlsRow extends StatelessWidget {
                   ),
                 ],
               ),
+              const SizedBox(height: 22),
               NooGroupedList(
                 children: [
                   NooSettingsRow(
@@ -179,6 +204,9 @@ class FilesControlsRow extends StatelessWidget {
                 ],
               ),
             ],
+          ),
+        ),
+      ],
     );
   }
 }