Proper pagination

lib/providers/tasks_provider.dart

@@ -192,8 +192,66 @@ final tasksProvider = StreamProvider<List<Task>>((ref) {
           .toList();
     }
 
-    // Sort: queue_order ASC, then created_at ASC
+    // Sort by status groups then within-group ordering:
+    // 1. queued – order by priority (desc), then queue_order (asc), then created_at
+    // 2. in_progress – preserve recent order (created_at asc)
+    // 3. completed – order by numeric task_number when available (asc)
+    // 4. other statuses – fallback to queue_order then created_at
+    final statusRank = (String s) {
+      switch (s) {
+        case 'queued':
+          return 0;
+        case 'in_progress':
+          return 1;
+        case 'completed':
+          return 2;
+        default:
+          return 3;
+      }
+    };
+
+    int? _parseTaskNumber(Task t) {
+      final tn = t.taskNumber;
+      if (tn == null) return null;
+      final m = RegExp(r'\d+').firstMatch(tn);
+      if (m == null) return null;
+      return int.tryParse(m.group(0)!);
+    }
+
     list.sort((a, b) {
+      final ra = statusRank(a.status);
+      final rb = statusRank(b.status);
+      final rcmp = ra.compareTo(rb);
+      if (rcmp != 0) return rcmp;
+
+      // Same status: apply within-group ordering
+      if (ra == 0) {
+        // queued: higher priority first, then queue_order asc, then created_at
+        final pcmp = b.priority.compareTo(a.priority);
+        if (pcmp != 0) return pcmp;
+        final aOrder = a.queueOrder ?? 0x7fffffff;
+        final bOrder = b.queueOrder ?? 0x7fffffff;
+        final qcmp = aOrder.compareTo(bOrder);
+        if (qcmp != 0) return qcmp;
+        return a.createdAt.compareTo(b.createdAt);
+      }
+
+      if (ra == 1) {
+        // in_progress: keep older first
+        return a.createdAt.compareTo(b.createdAt);
+      }
+
+      if (ra == 2) {
+        // completed: prefer numeric task_number DESC when present
+        final an = _parseTaskNumber(a);
+        final bn = _parseTaskNumber(b);
+        if (an != null && bn != null) return bn.compareTo(an);
+        if (an != null) return -1;
+        if (bn != null) return 1;
+        return b.createdAt.compareTo(a.createdAt);
+      }
+
+      // fallback: queue_order then created_at
       final aOrder = a.queueOrder ?? 0x7fffffff;
       final bOrder = b.queueOrder ?? 0x7fffffff;
       final cmp = aOrder.compareTo(bOrder);
@@ -201,11 +259,14 @@ final tasksProvider = StreamProvider<List<Task>>((ref) {
       return a.createdAt.compareTo(b.createdAt);
     });
 
-    // Pagination (server-side semantics emulated client-side)
-    final start = query.offset;
-    final end = (start + query.limit).clamp(0, list.length);
-    if (start >= list.length) return <Task>[];
-    return list.sublist(start, end);
+    // Return the full filtered & sorted list to allow the UI layer to
+    // perform pagination (desktop PaginatedDataTable expects the full
+    // row count so it can render pagination controls reliably). The
+    // Supabase stream currently delivers all rows and the provider
+    // applies filtering/sorting; leaving pagination to the UI avoids
+    // off-by-one issues where a full page of results would hide the
+    // presence of a next page.
+    return list;
   });
 });
 

lib/screens/admin/offices_screen.dart

@@ -109,6 +109,11 @@ class _OfficesScreenState extends ConsumerState<OfficesScreen> {
                         ref.read(officesQueryProvider.notifier).state =
                             const OfficeQuery(offset: 0, limit: 50);
                       },
+                      onPageChanged: (firstRow) {
+                        ref
+                            .read(officesQueryProvider.notifier)
+                            .update((q) => q.copyWith(offset: firstRow));
+                      },
                       isLoading: false,
                     );
 

lib/screens/admin/user_management_screen.dart

@@ -251,6 +251,11 @@ class _UserManagementScreenState extends ConsumerState<UserManagementScreen> {
           limit: 50,
         );
       },
+      onPageChanged: (firstRow) {
+        ref
+            .read(adminUserQueryProvider.notifier)
+            .update((q) => q.copyWith(offset: firstRow));
+      },
       isLoading: false,
     );
 

lib/screens/tasks/tasks_list_screen.dart

@@ -43,19 +43,28 @@ class TasksListScreen extends ConsumerStatefulWidget {
   ConsumerState<TasksListScreen> createState() => _TasksListScreenState();
 }
 
-class _TasksListScreenState extends ConsumerState<TasksListScreen> {
+class _TasksListScreenState extends ConsumerState<TasksListScreen>
+    with SingleTickerProviderStateMixin {
   final TextEditingController _subjectController = TextEditingController();
   String? _selectedOfficeId;
   String? _selectedStatus;
   String? _selectedAssigneeId;
   DateTimeRange? _selectedDateRange;
+  late final TabController _tabController;
 
   @override
   void dispose() {
     _subjectController.dispose();
+    _tabController.dispose();
     super.dispose();
   }
 
+  @override
+  void initState() {
+    super.initState();
+    _tabController = TabController(length: 2, vsync: this);
+  }
+
   bool get _hasTaskFilters {
     return _subjectController.text.trim().isNotEmpty ||
         _selectedOfficeId != null ||
@@ -67,6 +76,7 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen> {
   @override
   Widget build(BuildContext context) {
     final tasksAsync = ref.watch(tasksProvider);
+    final taskQuery = ref.watch(tasksQueryProvider);
     final ticketsAsync = ref.watch(ticketsProvider);
     final officesAsync = ref.watch(officesProvider);
     final profileAsync = ref.watch(currentProfileProvider);
@@ -255,6 +265,7 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen> {
                     ref.read(tasksQueryProvider.notifier).state =
                         const TaskQuery(offset: 0, limit: 50);
                   },
+                  onPageChanged: null,
                   isLoading: false,
                   columns: [
                     TasQColumn<Task>(
@@ -433,26 +444,25 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen> {
                     ),
                   ),
                   Expanded(
-                    child: DefaultTabController(
-                      length: 2,
-                      child: Column(
-                        children: [
-                          const TabBar(
-                            tabs: [
-                              Tab(text: 'My Tasks'),
-                              Tab(text: 'All Tasks'),
+                    child: Column(
+                      children: [
+                        TabBar(
+                          controller: _tabController,
+                          tabs: const [
+                            Tab(text: 'My Tasks'),
+                            Tab(text: 'All Tasks'),
+                          ],
+                        ),
+                        Expanded(
+                          child: TabBarView(
+                            controller: _tabController,
+                            children: [
+                              makeList(myTasks),
+                              makeList(filteredTasks),
                             ],
                           ),
-                          Expanded(
-                            child: TabBarView(
-                              children: [
-                                makeList(myTasks),
-                                makeList(filteredTasks),
-                              ],
-                            ),
-                          ),
-                        ],
-                      ),
+                        ),
+                      ],
                     ),
                   ),
                 ],

lib/screens/tickets/tickets_list_screen.dart

@@ -181,6 +181,11 @@ class _TicketsListScreenState extends ConsumerState<TicketsListScreen> {
                   ref.read(ticketsQueryProvider.notifier).state =
                       const TicketQuery(offset: 0, limit: 50);
                 },
+                onPageChanged: (firstRow) {
+                  ref
+                      .read(ticketsQueryProvider.notifier)
+                      .update((q) => q.copyWith(offset: firstRow));
+                },
                 isLoading: false,
                 columns: [
                   TasQColumn<Ticket>(

lib/widgets/tasq_adaptive_list.dart

@@ -51,10 +51,13 @@ class TasQAdaptiveList<T> extends StatelessWidget {
     this.rowActions,
     this.onRowTap,
     this.rowsPerPage = 50,
+    this.totalCount,
+    this.pageOffset = 0,
     this.tableHeader,
     this.filterHeader,
     this.summaryDashboard,
     this.onRequestRefresh,
+    this.onPageChanged,
     this.isLoading = false,
   });
 
@@ -78,6 +81,15 @@ class TasQAdaptiveList<T> extends StatelessWidget {
   /// Per CLAUDE.md: Standard page size is 50 items for Desktop.
   final int rowsPerPage;
 
+  /// Optional total number of rows in the full result set. When non-null
+  /// and [items] contains only the current page, this value will be used
+  /// as the `rowCount` for the table so pagination controls render correctly.
+  final int? totalCount;
+
+  /// Offset of the first item in [items] relative to the full result set.
+  /// Used when [totalCount] is provided and [items] represents a page.
+  final int pageOffset;
+
   /// Optional header widget for the desktop table.
   final Widget? tableHeader;
 
@@ -87,9 +99,21 @@ class TasQAdaptiveList<T> extends StatelessWidget {
   /// Optional summary dashboard widget (e.g., status counts).
   final Widget? summaryDashboard;
 
-  /// Callback when the user requests refresh (infinite scroll or pagination).
+  /// Callback when the user requests refresh (infinite scroll or pagination.
+  ///
+  /// * **Mobile** – invoked when the user scrolls to the end of the list.
+  /// * **Desktop** – *not* triggered by page changes (see [onPageChanged]).
   final void Function()? onRequestRefresh;
 
+  /// Desktop-only callback invoked when the paginated table changes page.
+  ///
+  /// The integer parameter is the first row index for the newly visible
+  /// page, which corresponds directly to the `offset` value used by our
+  /// server-side pagination providers. Consumers should update the
+  /// associated query provider (e.g. `tasksQueryProvider`) so that the
+  /// underlying stream/future is refreshed with the new range.
+  final void Function(int firstRowIndex)? onPageChanged;
+
   /// If true, shows a loading indicator for server-side pagination.
   final bool isLoading;
 
@@ -228,6 +252,8 @@ class TasQAdaptiveList<T> extends StatelessWidget {
       columns: columns,
       rowActions: rowActions,
       onRowTap: onRowTap,
+      offset: pageOffset,
+      totalCount: totalCount,
     );
 
     // Use progressively smaller fractions of the viewport on larger screens
@@ -248,7 +274,7 @@ class TasQAdaptiveList<T> extends StatelessWidget {
     );
     final effectiveRowsPerPage = math.min(
       rowsPerPage,
-      math.max(1, items.length),
+      math.max(1, totalCount ?? items.length),
     );
 
     // wrap horizontal scroll with a visible scrollbar on desktop. the
@@ -278,6 +304,7 @@ class TasQAdaptiveList<T> extends StatelessWidget {
               if (rowActions != null) const DataColumn(label: Text('Actions')),
             ],
             source: dataSource,
+            onPageChanged: onPageChanged,
           ),
         ),
       ),
@@ -360,6 +387,8 @@ class _TasQTableSource<T> extends DataTableSource {
     required this.columns,
     required this.rowActions,
     required this.onRowTap,
+    this.offset = 0,
+    this.totalCount,
   });
 
   final BuildContext context;
@@ -367,11 +396,19 @@ class _TasQTableSource<T> extends DataTableSource {
   final List<TasQColumn<T>> columns;
   final TasQRowActions<T>? rowActions;
   final TasQRowTap<T>? onRowTap;
+  final int offset;
+  final int? totalCount;
 
   @override
   DataRow? getRow(int index) {
-    if (index >= items.length) return null;
-    final item = items[index];
+    // Map the global table index to the local items page using the
+    // provided offset. If items contains the full dataset, offset will be
+    // zero and this reduces to a direct index. If items contains only the
+    // current page, index may be outside the local range — return null in
+    // that case so the table can render blanks for non-loaded rows.
+    final localIndex = index - offset;
+    if (localIndex < 0 || localIndex >= items.length) return null;
+    final item = items[localIndex];
     final cells = <DataCell>[];
 
     for (final column in columns) {
@@ -396,7 +433,7 @@ class _TasQTableSource<T> extends DataTableSource {
   bool get isRowCountApproximate => false;
 
   @override
-  int get rowCount => items.length;
+  int get rowCount => totalCount ?? items.length;
 
   @override
   int get selectedRowCount => 0;