feat: add selected date read controller

apps/focus_flow_flutter/lib/app/demo_scheduler_composition.dart

@@ -8,6 +8,7 @@ import 'package:scheduler_core/scheduler_core.dart';
 
 import '../controllers/scheduler_command_controller.dart';
 import '../controllers/scheduler_read_controller.dart';
+import '../controllers/selected_date_controller.dart';
 import '../controllers/today_screen_controller.dart';
 import 'scheduler_app_composition.dart';
 
@@ -56,12 +57,28 @@ class DemoSchedulerComposition implements SchedulerAppComposition {
 
   /// Human-readable label for [date].
   @override
-  String get dateLabel => formatSchedulerDateLabel(date);
+  String get dateLabel => dateLabelFor(date);
+
+  /// Initial selected owner-local planning date.
+  @override
+  CivilDate get initialDate => date;
 
   /// Default project id used by quick capture.
   @override
   String get defaultProjectId => projectId;
 
+  /// Formats [date] for compact UI date labels.
+  @override
+  String dateLabelFor(CivilDate date) {
+    return formatSchedulerDateLabel(date);
+  }
+
+  /// Creates the controller that owns the visible planning date.
+  @override
+  SelectedDateController createSelectedDateController() {
+    return SelectedDateController(initialDate: initialDate);
+  }
+
   /// Creates a deterministic seeded composition for the demo app and tests.
   factory DemoSchedulerComposition.seeded({
     Clock? clock,
@@ -122,9 +139,13 @@ class DemoSchedulerComposition implements SchedulerAppComposition {
 
   /// Creates the controller used by the compact Today screen mockup.
   @override
-  TodayScreenController createTodayScreenController() {
+  TodayScreenController createTodayScreenController({
+    required SelectedDateController selectedDates,
+  }) {
     return TodayScreenController(
-      read: () {
+      selectedDates: selectedDates,
+      dateLabelFor: dateLabelFor,
+      read: (date) {
         return todayQuery.execute(
           GetTodayStateRequest(
             context: context('ui-plan-1-read-today'),
@@ -173,11 +194,12 @@ class DemoSchedulerComposition implements SchedulerAppComposition {
   @override
   SchedulerCommandController createCommandController({
     required ReadRefresh refreshReads,
+    required SelectedDateReader selectedDate,
   }) {
     return SchedulerCommandController(
       commands: commandUseCases,
       contextFor: context,
-      localDate: date,
+      selectedDate: selectedDate,
       refreshReads: refreshReads,
       quickCaptureProjectId: defaultProjectId,
     );

apps/focus_flow_flutter/lib/app/focus_flow_app.dart

@@ -9,6 +9,7 @@ import 'dart:async';
 import 'package:flutter/material.dart';
 
 import '../controllers/scheduler_command_controller.dart';
+import '../controllers/selected_date_controller.dart';
 import '../controllers/today_screen_controller.dart';
 import '../models/today_screen_models.dart';
 import '../theme/focus_flow_theme.dart';

apps/focus_flow_flutter/lib/app/home/focus_flow_home_state.dart

@@ -10,6 +10,10 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
   /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   late final TodayScreenController controller;
 
+  /// Stores the `selectedDateController` value for this object.
+  /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
+  late final SelectedDateController selectedDateController;
+
   /// Stores the `commandController` value for this object.
   /// This field is part of the explicit state that downstream scheduling, persistence, or UI code reads when composing behavior.
   late final SchedulerCommandController commandController;
@@ -19,9 +23,13 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
   @override
   void initState() {
     super.initState();
-    controller = widget.composition.createTodayScreenController();
+    selectedDateController = widget.composition.createSelectedDateController();
+    controller = widget.composition.createTodayScreenController(
+      selectedDates: selectedDateController,
+    );
     commandController = widget.composition.createCommandController(
       refreshReads: controller.load,
+      selectedDate: () => selectedDateController.date,
     );
     controller.load();
   }
@@ -32,6 +40,7 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
   void dispose() {
     commandController.dispose();
     controller.dispose();
+    selectedDateController.dispose();
     unawaited(widget.composition.dispose());
     super.dispose();
   }
@@ -75,10 +84,8 @@ class _FocusFlowHomeState extends State<FocusFlowHome> {
               TodayScreenFailure(:final message) => _PlanIssue(
                 message: message,
               ),
-              TodayScreenEmpty() => _TodayScreenScaffold(
-                data: TodayScreenData.empty(
-                  dateLabel: widget.composition.dateLabel,
-                ),
+              TodayScreenEmpty(:final data) => _TodayScreenScaffold(
+                data: data,
                 selectedCard: controller.selectedCard,
                 onSelectCard: controller.selectCard,
                 onCompleteCard: _toggleCardCompletion,

apps/focus_flow_flutter/lib/app/home/today_screen_scaffold_state.dart

@@ -27,6 +27,18 @@ class _TodayScreenScaffoldState extends State<_TodayScreenScaffold> {
     });
   }
 
+  /// Performs the `didUpdateWidget` behavior for this scheduler component.
+  /// The method provides a named entry point for this operation so callers do not need to know the lower-level state or persistence steps involved.
+  @override
+  void didUpdateWidget(covariant _TodayScreenScaffold oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.data.dateLabel == widget.data.dateLabel) {
+      return;
+    }
+    _timelineScrollTargetCardId = null;
+    _timelineScrollRequest = 0;
+  }
+
   /// Builds the widget subtree for this component.
   /// The method translates the current widget configuration and state into Flutter UI without mutating scheduler domain data.
   @override

apps/focus_flow_flutter/lib/app/persistent_scheduler_composition.dart

@@ -10,6 +10,7 @@ import 'package:scheduler_core/scheduler_core.dart';
 import 'package:scheduler_persistence_sqlite/sqlite.dart';
 
 import '../controllers/scheduler_command_controller.dart';
+import '../controllers/selected_date_controller.dart';
 import '../controllers/today_screen_controller.dart';
 import 'demo_scheduler_composition.dart' show formatSchedulerDateLabel;
 import 'scheduler_app_composition.dart';
@@ -106,13 +107,33 @@ final class PersistentSchedulerComposition implements SchedulerAppComposition {
 
   /// Human-readable label for [date].
   @override
-  String get dateLabel => formatSchedulerDateLabel(date);
+  String get dateLabel => dateLabelFor(date);
+
+  /// Initial selected owner-local planning date.
+  @override
+  CivilDate get initialDate => date;
+
+  /// Formats [date] for compact UI date labels.
+  @override
+  String dateLabelFor(CivilDate date) {
+    return formatSchedulerDateLabel(date);
+  }
+
+  /// Creates the controller that owns the visible planning date.
+  @override
+  SelectedDateController createSelectedDateController() {
+    return SelectedDateController(initialDate: initialDate);
+  }
 
   /// Creates the controller used by the compact Today screen mockup.
   @override
-  TodayScreenController createTodayScreenController() {
+  TodayScreenController createTodayScreenController({
+    required SelectedDateController selectedDates,
+  }) {
     return TodayScreenController(
-      read: () {
+      selectedDates: selectedDates,
+      dateLabelFor: dateLabelFor,
+      read: (date) {
         return todayQuery.execute(
           GetTodayStateRequest(
             context: context('ui-plan-1-read-today'),
@@ -128,11 +149,12 @@ final class PersistentSchedulerComposition implements SchedulerAppComposition {
   @override
   SchedulerCommandController createCommandController({
     required ReadRefresh refreshReads,
+    required SelectedDateReader selectedDate,
   }) {
     return SchedulerCommandController(
       commands: commandUseCases,
       contextFor: context,
-      localDate: date,
+      selectedDate: selectedDate,
       refreshReads: refreshReads,
       quickCaptureProjectId: defaultProjectId,
     );

apps/focus_flow_flutter/lib/app/scheduler_app_composition.dart

@@ -4,7 +4,10 @@
 /// Defines the app composition protocol used by FocusFlow widgets.
 library;
 
+import 'package:scheduler_core/scheduler_core.dart';
+
 import '../controllers/scheduler_command_controller.dart';
+import '../controllers/selected_date_controller.dart';
 import '../controllers/today_screen_controller.dart';
 
 /// Runtime-independent composition surface consumed by the app shell.
@@ -12,15 +15,27 @@ abstract interface class SchedulerAppComposition {
   /// Human-readable label for the selected local date.
   String get dateLabel;
 
+  /// Initial selected owner-local planning date.
+  CivilDate get initialDate;
+
   /// Default project id used by quick-capture commands.
   String get defaultProjectId;
 
+  /// Formats [date] for compact UI date labels.
+  String dateLabelFor(CivilDate date);
+
+  /// Creates the controller that owns the visible planning date.
+  SelectedDateController createSelectedDateController();
+
   /// Creates the controller used by the compact Today screen.
-  TodayScreenController createTodayScreenController();
+  TodayScreenController createTodayScreenController({
+    required SelectedDateController selectedDates,
+  });
 
   /// Creates the command controller used by interactive scheduler controls.
   SchedulerCommandController createCommandController({
     required ReadRefresh refreshReads,
+    required SelectedDateReader selectedDate,
   });
 
   /// Releases resources owned by the composition.

apps/focus_flow_flutter/lib/controllers/command/scheduler_command_callbacks.dart

@@ -9,3 +9,6 @@ typedef OperationContextFactory =
 
 /// Refreshes any reads that should reflect a completed command.
 typedef ReadRefresh = Future<void> Function();
+
+/// Reads the owner-local date that commands should target at execution time.
+typedef SchedulerSelectedDateReader = CivilDate Function();

apps/focus_flow_flutter/lib/controllers/command/scheduler_command_controller_impl.dart

@@ -9,7 +9,7 @@ class SchedulerCommandController extends ChangeNotifier {
   SchedulerCommandController({
     required this.commands,
     required this.contextFor,
-    required this.localDate,
+    required this.selectedDate,
     required this.refreshReads,
     required this.quickCaptureProjectId,
     DateTime Function()? now,
@@ -21,8 +21,8 @@ class SchedulerCommandController extends ChangeNotifier {
   /// Factory for command-scoped application operation contexts.
   final OperationContextFactory contextFor;
 
-  /// Local date commands should operate against.
-  final CivilDate localDate;
+  /// Reads the selected local date commands should operate against.
+  final SchedulerSelectedDateReader selectedDate;
 
   /// Refresh callback invoked after commands that mutate read state.
   final ReadRefresh refreshReads;
@@ -57,8 +57,9 @@ class SchedulerCommandController extends ChangeNotifier {
       successMessage: 'Task captured',
       refreshAfterSuccess: true,
       action: (operationId) {
+        final commandAt = now();
         return commands.quickCaptureToBacklog(
-          context: contextFor(operationId),
+          context: contextFor(operationId, now: commandAt),
           title: title,
           projectId: quickCaptureProjectId,
         );
@@ -73,9 +74,10 @@ class SchedulerCommandController extends ChangeNotifier {
       successMessage: 'Task added',
       refreshAfterSuccess: true,
       action: (operationId) {
+        final commandAt = now();
         return commands.quickCaptureToNextAvailableSlot(
-          context: contextFor(operationId),
-          localDate: localDate,
+          context: contextFor(operationId, now: commandAt),
+          localDate: selectedDate(),
           title: _genericFlexibleTaskTitle,
           durationMinutes: _genericFlexibleTaskDurationMinutes,
           projectId: quickCaptureProjectId,
@@ -95,9 +97,10 @@ class SchedulerCommandController extends ChangeNotifier {
       successMessage: 'Task scheduled',
       refreshAfterSuccess: true,
       action: (operationId) {
+        final commandAt = now();
         return commands.scheduleBacklogItemToNextAvailableSlot(
-          context: contextFor(operationId),
-          localDate: localDate,
+          context: contextFor(operationId, now: commandAt),
+          localDate: selectedDate(),
           taskId: taskId,
           durationMinutes: durationMinutes,
           expectedUpdatedAt: expectedUpdatedAt,
@@ -134,14 +137,14 @@ class SchedulerCommandController extends ChangeNotifier {
         return switch (taskType) {
           TaskType.flexible => commands.completeFlexibleTask(
             context: context,
-            localDate: localDate,
+            localDate: selectedDate(),
             taskId: taskId,
             expectedUpdatedAt: expectedUpdatedAt,
           ),
           TaskType.critical ||
           TaskType.inflexible => commands.applyRequiredTaskAction(
             context: context,
-            localDate: localDate,
+            localDate: selectedDate(),
             taskId: taskId,
             action: RequiredTaskAction.done,
             expectedUpdatedAt: expectedUpdatedAt,
@@ -175,7 +178,7 @@ class SchedulerCommandController extends ChangeNotifier {
       action: (operationId) {
         return commands.uncompleteTask(
           context: contextFor(operationId, now: occurredAt),
-          localDate: localDate,
+          localDate: selectedDate(),
           taskId: taskId,
           expectedUpdatedAt: expectedUpdatedAt,
         );

apps/focus_flow_flutter/lib/controllers/selected_date_controller.dart

@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/// Coordinates selected planning date state for FocusFlow.
+library;
+
+import 'package:flutter/foundation.dart';
+import 'package:scheduler_core/scheduler_core.dart';
+
+/// Reads the currently selected owner-local planning date.
+typedef SelectedDateReader = CivilDate Function();
+
+/// Owns the visible owner-local planning day.
+class SelectedDateController extends ChangeNotifier {
+  /// Creates a selected-date controller initialized to [initialDate].
+  SelectedDateController({required CivilDate initialDate})
+    : _date = initialDate;
+
+  /// Private state storing the currently selected date.
+  CivilDate _date;
+
+  /// Current visible owner-local planning date.
+  CivilDate get date => _date;
+
+  /// Selects [date] as the visible planning day.
+  bool selectDate(CivilDate date) {
+    if (date == _date) {
+      return false;
+    }
+    _date = date;
+    notifyListeners();
+    return true;
+  }
+
+  /// Moves the selected planning day backward by one civil day.
+  bool selectPreviousDay() {
+    return selectDate(_date.addDays(-1));
+  }
+
+  /// Moves the selected planning day forward by one civil day.
+  bool selectNextDay() {
+    return selectDate(_date.addDays(1));
+  }
+}

apps/focus_flow_flutter/lib/controllers/today_screen_controller.dart

@@ -4,13 +4,20 @@
 /// Coordinates Today Screen Controller state for the FocusFlow Flutter UI.
 library;
 
+import 'dart:async';
+
 import 'package:flutter/foundation.dart';
 import 'package:scheduler_core/scheduler_core.dart';
 
 import '../models/today_screen_models.dart';
+import 'selected_date_controller.dart';
 
 /// Reads Today state from the scheduler application layer.
-typedef TodayStateReader = Future<ApplicationResult<TodayState>> Function();
+typedef TodayStateReader =
+    Future<ApplicationResult<TodayState>> Function(CivilDate date);
+
+/// Formats a selected date for Today screen loading and empty states.
+typedef TodayDateLabelFormatter = String Function(CivilDate date);
 
 /// Base state for the compact Today screen.
 sealed class TodayScreenState {
@@ -21,7 +28,10 @@ sealed class TodayScreenState {
 /// Indicates that the Today screen is loading.
 class TodayScreenLoading extends TodayScreenState {
   /// Creates a loading Today screen state.
-  const TodayScreenLoading();
+  const TodayScreenLoading(this.dateLabel);
+
+  /// Display-ready date label for the read in progress.
+  final String dateLabel;
 }
 
 /// Indicates that the Today screen has renderable timeline data.
@@ -36,49 +46,86 @@ class TodayScreenReady extends TodayScreenState {
 /// Indicates that the Today screen loaded successfully with no cards.
 class TodayScreenEmpty extends TodayScreenState {
   /// Creates an empty Today screen state.
-  const TodayScreenEmpty();
+  const TodayScreenEmpty(this.data);
+
+  /// Empty presentation model for the selected date.
+  final TodayScreenData data;
 }
 
 /// Indicates that the Today screen failed to load.
 class TodayScreenFailure extends TodayScreenState {
   /// Creates a failure state with a displayable [message].
-  const TodayScreenFailure(this.message);
+  const TodayScreenFailure({required this.message, required this.data});
 
   /// User-facing failure message or code.
   final String message;
+
+  /// Empty presentation model for the selected date that failed to load.
+  final TodayScreenData data;
 }
 
 /// Loads Today screen data and tracks selected timeline cards.
 class TodayScreenController extends ChangeNotifier {
   /// Creates a Today screen controller from a read callback.
-  TodayScreenController({required this.read});
+  TodayScreenController({
+    required this.read,
+    required this.selectedDates,
+    required this.dateLabelFor,
+  }) : _state = TodayScreenLoading(dateLabelFor(selectedDates.date)) {
+    selectedDates.addListener(_handleSelectedDateChanged);
+  }
 
   /// Callback used to read Today state.
   final TodayStateReader read;
 
+  /// Selected planning date that drives Today reads.
+  final SelectedDateController selectedDates;
+
+  /// Formats dates before a backend read has returned screen data.
+  final TodayDateLabelFormatter dateLabelFor;
+
   /// Private state stored as `_state` for this implementation.
   /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
-  TodayScreenState _state = const TodayScreenLoading();
+  TodayScreenState _state;
 
   /// Private state stored as `_selectedCard` for this implementation.
   /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
   TimelineCardModel? _selectedCard;
 
+  /// Private state stored as `_loadSequence` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
+  var _loadSequence = 0;
+
+  /// Private state stored as `_isDisposed` for this implementation.
+  /// The field is intentionally scoped to this library so only the owning type can change the related scheduler or UI behavior.
+  var _isDisposed = false;
+
   /// Current Today screen loading/data/failure state.
   TodayScreenState get state => _state;
 
   /// Currently selected timeline card, if a modal should be visible.
   TimelineCardModel? get selectedCard => _selectedCard;
 
+  /// Current selected owner-local planning date.
+  CivilDate get selectedDate => selectedDates.date;
+
   /// Loads Today state and maps it into presentation data.
   Future<void> load() async {
-    _state = const TodayScreenLoading();
+    final date = selectedDates.date;
+    final sequence = _nextLoadSequence();
+    _state = TodayScreenLoading(dateLabelFor(date));
     notifyListeners();
     try {
-      final result = await read();
+      final result = await read(date);
+      if (_isStale(sequence)) {
+        return;
+      }
       final failure = result.failure;
       if (failure != null) {
-        _state = TodayScreenFailure(failure.detailCode ?? failure.code.name);
+        _state = TodayScreenFailure(
+          message: failure.detailCode ?? failure.code.name,
+          data: _emptyDataFor(date),
+        );
         notifyListeners();
         return;
       }
@@ -86,11 +133,17 @@ class TodayScreenController extends ChangeNotifier {
       final data = TodayScreenData.fromTodayState(result.requireValue);
       _syncSelectedCard(data);
       _state = data.cards.isEmpty
-          ? const TodayScreenEmpty()
+          ? TodayScreenEmpty(data)
           : TodayScreenReady(data);
       notifyListeners();
     } on Object catch (error) {
-      _state = TodayScreenFailure(error.toString());
+      if (_isStale(sequence)) {
+        return;
+      }
+      _state = TodayScreenFailure(
+        message: error.toString(),
+        data: _emptyDataFor(date),
+      );
       notifyListeners();
     }
   }
@@ -113,6 +166,40 @@ class TodayScreenController extends ChangeNotifier {
     notifyListeners();
   }
 
+  /// Releases selected-date listeners owned by this controller.
+  @override
+  void dispose() {
+    _isDisposed = true;
+    selectedDates.removeListener(_handleSelectedDateChanged);
+    super.dispose();
+  }
+
+  /// Runs the `_handleSelectedDateChanged` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
+  void _handleSelectedDateChanged() {
+    _selectedCard = null;
+    unawaited(load());
+  }
+
+  /// Runs the `_nextLoadSequence` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
+  int _nextLoadSequence() {
+    _loadSequence += 1;
+    return _loadSequence;
+  }
+
+  /// Runs the `_isStale` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
+  bool _isStale(int sequence) {
+    return _isDisposed || sequence != _loadSequence;
+  }
+
+  /// Runs the `_emptyDataFor` helper used inside this library.
+  /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
+  TodayScreenData _emptyDataFor(CivilDate date) {
+    return TodayScreenData.empty(dateLabel: dateLabelFor(date));
+  }
+
   /// Runs the `_syncSelectedCard` helper used inside this library.
   /// The helper centralizes a small piece of transformation or validation so higher-level scheduler flow remains easier to read.
   void _syncSelectedCard(TodayScreenData data) {

apps/focus_flow_flutter/test/controllers/selected_date_controller_test.dart

@@ -0,0 +1,62 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/// Tests selected date controller behavior.
+library;
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:scheduler_core/scheduler_core.dart';
+
+import 'package:focus_flow_flutter/controllers/selected_date_controller.dart';
+
+/// Runs selected date controller tests.
+void main() {
+  test('selectDate is a no-op when the date is unchanged', () {
+    final controller = SelectedDateController(
+      initialDate: CivilDate(2026, 7, 2),
+    );
+    addTearDown(controller.dispose);
+
+    var notifications = 0;
+    controller.addListener(() {
+      notifications += 1;
+    });
+
+    final changed = controller.selectDate(CivilDate(2026, 7, 2));
+
+    expect(changed, isFalse);
+    expect(controller.date, CivilDate(2026, 7, 2));
+    expect(notifications, 0);
+  });
+
+  test('previous and next move exactly one civil day', () {
+    final controller = SelectedDateController(
+      initialDate: CivilDate(2026, 7, 2),
+    );
+    addTearDown(controller.dispose);
+
+    expect(controller.selectPreviousDay(), isTrue);
+    expect(controller.date, CivilDate(2026, 7, 1));
+
+    expect(controller.selectNextDay(), isTrue);
+    expect(controller.date, CivilDate(2026, 7, 2));
+  });
+
+  test('direct selection notifies listeners once for a changed date', () {
+    final controller = SelectedDateController(
+      initialDate: CivilDate(2026, 7, 2),
+    );
+    addTearDown(controller.dispose);
+
+    var notifications = 0;
+    controller.addListener(() {
+      notifications += 1;
+    });
+
+    final changed = controller.selectDate(CivilDate(2026, 8, 14));
+
+    expect(changed, isTrue);
+    expect(controller.date, CivilDate(2026, 8, 14));
+    expect(notifications, 1);
+  });
+}

apps/focus_flow_flutter/test/controllers/today_screen_controller_test.dart

@@ -0,0 +1,225 @@
+// SPDX-FileCopyrightText: 2026 FocusFlow contributors
+// SPDX-License-Identifier: AGPL-3.0-only
+
+/// Tests Today screen controller date-aware read behavior.
+library;
+
+import 'dart:async';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:scheduler_core/scheduler_core.dart';
+
+import 'package:focus_flow_flutter/controllers/selected_date_controller.dart';
+import 'package:focus_flow_flutter/controllers/today_screen_controller.dart';
+
+/// Runs Today screen controller tests.
+void main() {
+  test(
+    'load reads the selected date and shows empty data for that date',
+    () async {
+      final selectedDates = SelectedDateController(initialDate: _july2);
+      addTearDown(selectedDates.dispose);
+      final reads = <CivilDate>[];
+      final controller = TodayScreenController(
+        selectedDates: selectedDates,
+        dateLabelFor: _label,
+        read: (date) async {
+          reads.add(date);
+          return ApplicationResult.success(_todayState(date));
+        },
+      );
+      addTearDown(controller.dispose);
+
+      await controller.load();
+
+      expect(reads, [_july2]);
+      final state = controller.state;
+      expect(state, isA<TodayScreenEmpty>());
+      expect((state as TodayScreenEmpty).data.dateLabel, 'July 2, 2026');
+    },
+  );
+
+  test(
+    'date changes trigger distinct reads and clear selected cards',
+    () async {
+      final selectedDates = SelectedDateController(initialDate: _july2);
+      addTearDown(selectedDates.dispose);
+      final reads = <CivilDate>[];
+      final controller = TodayScreenController(
+        selectedDates: selectedDates,
+        dateLabelFor: _label,
+        read: (date) async {
+          reads.add(date);
+          return ApplicationResult.success(
+            _todayState(
+              date,
+              items: date == _july2 ? [_timelineItem('first-task', date)] : [],
+            ),
+          );
+        },
+      );
+      addTearDown(controller.dispose);
+
+      await controller.load();
+      final ready = controller.state as TodayScreenReady;
+      controller.selectCard(ready.data.cards.single);
+      expect(controller.selectedCard?.id, 'first-task');
+
+      selectedDates.selectNextDay();
+      await _flushAsyncWork();
+
+      expect(reads, [_july2, _july3]);
+      expect(controller.selectedCard, isNull);
+      final state = controller.state;
+      expect(state, isA<TodayScreenEmpty>());
+      expect((state as TodayScreenEmpty).data.dateLabel, 'July 3, 2026');
+    },
+  );
+
+  test('read failures keep selected date without showing old data', () async {
+    final selectedDates = SelectedDateController(initialDate: _july2);
+    addTearDown(selectedDates.dispose);
+    final controller = TodayScreenController(
+      selectedDates: selectedDates,
+      dateLabelFor: _label,
+      read: (date) async {
+        return ApplicationResult.failure(
+          const ApplicationFailure(
+            code: ApplicationFailureCode.persistenceFailure,
+            detailCode: 'readFailed',
+          ),
+        );
+      },
+    );
+    addTearDown(controller.dispose);
+
+    await controller.load();
+
+    expect(controller.selectedDate, _july2);
+    final state = controller.state;
+    expect(state, isA<TodayScreenFailure>());
+    expect((state as TodayScreenFailure).message, 'readFailed');
+    expect(state.data.dateLabel, 'July 2, 2026');
+  });
+
+  test(
+    'older in-flight reads cannot overwrite the latest selected date',
+    () async {
+      final selectedDates = SelectedDateController(initialDate: _july2);
+      addTearDown(selectedDates.dispose);
+      final firstRead = Completer<ApplicationResult<TodayState>>();
+      final secondRead = Completer<ApplicationResult<TodayState>>();
+      final controller = TodayScreenController(
+        selectedDates: selectedDates,
+        dateLabelFor: _label,
+        read: (date) {
+          if (date == _july2) {
+            return firstRead.future;
+          }
+          if (date == _july3) {
+            return secondRead.future;
+          }
+          throw StateError('Unexpected read date: ${date.toIsoString()}');
+        },
+      );
+      addTearDown(controller.dispose);
+
+      final firstLoad = controller.load();
+      selectedDates.selectNextDay();
+      await _flushAsyncWork();
+      secondRead.complete(ApplicationResult.success(_todayState(_july3)));
+      await _flushAsyncWork();
+
+      final latest = controller.state;
+      expect(latest, isA<TodayScreenEmpty>());
+      expect((latest as TodayScreenEmpty).data.dateLabel, 'July 3, 2026');
+
+      firstRead.complete(ApplicationResult.success(_todayState(_july2)));
+      await firstLoad;
+      await _flushAsyncWork();
+
+      final unchanged = controller.state;
+      expect(unchanged, isA<TodayScreenEmpty>());
+      expect((unchanged as TodayScreenEmpty).data.dateLabel, 'July 3, 2026');
+    },
+  );
+}
+
+/// First controller test date.
+final _july2 = CivilDate(2026, 7, 2);
+
+/// Next controller test date.
+final _july3 = CivilDate(2026, 7, 3);
+
+/// Formats [date] as a long month/day/year label.
+String _label(CivilDate date) {
+  const months = [
+    'January',
+    'February',
+    'March',
+    'April',
+    'May',
+    'June',
+    'July',
+    'August',
+    'September',
+    'October',
+    'November',
+    'December',
+  ];
+  return '${months[date.month - 1]} ${date.day}, ${date.year}';
+}
+
+/// Waits for microtask-scheduled controller reloads.
+Future<void> _flushAsyncWork() async {
+  await Future<void>.delayed(Duration.zero);
+  await Future<void>.delayed(Duration.zero);
+}
+
+/// Builds a lightweight Today state for [date].
+TodayState _todayState(
+  CivilDate date, {
+  List<TodayTimelineItem> items = const [],
+}) {
+  final dayStart = DateTime.utc(date.year, date.month, date.day);
+  return TodayState(
+    date: date,
+    ownerId: 'owner-1',
+    timeZoneId: 'UTC',
+    readAt: dayStart.add(const Duration(hours: 12)),
+    dayStart: dayStart,
+    dayEnd: dayStart.add(const Duration(days: 1)),
+    ownerSettings: OwnerSettings(ownerId: 'owner-1', timeZoneId: 'UTC'),
+    timelineItems: items,
+    compactState: const TodayCompactState(
+      manualCompactModeEnabled: true,
+      fullTimelineExpanded: false,
+    ),
+    pendingNotices: const [],
+  );
+}
+
+/// Builds one planned timeline item on [date].
+TodayTimelineItem _timelineItem(String id, CivilDate date) {
+  final start = DateTime.utc(date.year, date.month, date.day, 9);
+  return TodayTimelineItem(
+    item: TimelineItem(
+      id: id,
+      displayTitle: 'Task $id',
+      taskType: TaskType.flexible,
+      projectColorToken: 'project-home',
+      backgroundToken: TimelineBackgroundToken.flexible,
+      rewardIconToken: TimelineRewardIconToken.medium,
+      difficultyIconToken: TimelineDifficultyIconToken.medium,
+      showsExplicitTime: true,
+      quickActions: const [],
+      category: TimelineItemCategory.taskCard,
+      start: start,
+      end: start.add(const Duration(minutes: 30)),
+      durationMinutes: 30,
+    ),
+    source: TodayTimelineItemSource.task,
+    taskStatus: TaskStatus.planned,
+    taskId: id,
+  );
+}

apps/focus_flow_flutter/test/persistent_composition_test.dart

@@ -40,6 +40,7 @@ void main() {
 
       final commandController = composition.createCommandController(
         refreshReads: () async {},
+        selectedDate: () => composition.initialDate,
       );
       addTearDown(commandController.dispose);
       await tester.runAsync(