feat(timer): implement periodic task time saving with 10-second intervals

src/lib/presentation/ui/features/tasks/components/task_details_content.dart

@@ -90,6 +90,7 @@ class TaskDetailsContentState extends State<TaskDetailsContent> {
 
   // Set to track which optional fields are visible
   final Set<String> _visibleOptionalFields = {};
+  Duration _timeSinceLastSave = Duration.zero;
 
   // Define optional field keys
   static const String keyTags = 'tags';
@@ -1400,22 +1401,51 @@ class TaskDetailsContentState extends State<TaskDetailsContent> {
           ),
           child: AppTimer(
             isMiniLayout: true,
+            onTick: _handleTimerTick,
             onTimerStop: _onTaskTimerStop,
+            onWorkSessionComplete: _onTaskWorkSessionComplete,
           ),
         ),
       );
 
-  // Timer event handlers
-  void _onTaskTimerStop(Duration totalElapsed) {
+  void _handleTimerTick(Duration elapsedIncrement) {
+    // Use the elapsed increment provided by the timer
+    _timeSinceLastSave += elapsedIncrement;
+    if (_timeSinceLastSave.inSeconds >= TaskUiConstants.kPeriodicSaveIntervalSeconds) {
+      _saveTaskTime(_timeSinceLastSave);
+      _timeSinceLastSave = Duration.zero;
+    }
+  }
+
+  void _saveTaskTime(Duration elapsed) {
     if (!mounted) return;
     if (_task?.id == null) return;
+    if (elapsed.inSeconds <= 0) return;
 
-    // Only save if there's actual time elapsed
-    if (totalElapsed.inSeconds > 0) {
-      final command =
-          AddTaskTimeRecordCommand(duration: totalElapsed.inSeconds, taskId: _task!.id, customDateTime: DateTime.now());
-      _mediator.send(command);
-      _tasksService.notifyTaskUpdated(_task!.id);
+    final command = AddTaskTimeRecordCommand(
+      duration: elapsed.inSeconds,
+      taskId: _task!.id,
+      customDateTime: DateTime.now(),
+    );
+    _mediator.send(command);
+    _tasksService.notifyTaskUpdated(_task!.id);
+  }
+
+  /// Called when a work session completes (e.g., Pomodoro work → break transition).
+  /// Flushes any accumulated elapsed time for the current task.
+  void _onTaskWorkSessionComplete(Duration totalElapsed) {
+    if (_timeSinceLastSave > Duration.zero) {
+      _saveTaskTime(_timeSinceLastSave);
+      _timeSinceLastSave = Duration.zero;
+    }
+  }
+
+  /// Called when the timer actually stops (user stops / session ends).
+  /// Flushes accumulated elapsed time for the current task.
+  void _onTaskTimerStop(Duration totalElapsed) {
+    if (_timeSinceLastSave > Duration.zero) {
+      _saveTaskTime(_timeSinceLastSave);
+      _timeSinceLastSave = Duration.zero;
     }
   }
 }

src/lib/presentation/ui/features/tasks/components/timer.dart

@@ -23,16 +23,21 @@ import 'package:whph/presentation/ui/shared/services/abstraction/i_translation_s
 import 'package:whph/presentation/ui/shared/utils/app_theme_helper.dart';
 
 class AppTimer extends StatefulWidget {
-  final Function(Duration)? onTick; // For UI updates only - receives current elapsed/remaining time
+  /// Callback invoked on each timer tick with the logical elapsed increment.
+  /// In debug mode, the increment is 1 minute per tick; in release, 1 second per tick.
+  /// Callers must use the elapsedIncrement parameter instead of assuming a fixed 1 second.
+  final void Function(Duration elapsedIncrement)? onTick;
   final VoidCallback? onTimerStart;
-  final Function(Duration)? onTimerStop; // For data persistence - receives total elapsed duration
-  final bool isMiniLayout; // Use compact layout for detail tables
+  final Function(Duration)? onTimerStop;
+  final Function(Duration)? onWorkSessionComplete;
+  final bool isMiniLayout;
 
   const AppTimer({
     super.key,
     this.onTick,
     this.onTimerStart,
     this.onTimerStop,
+    this.onWorkSessionComplete,
     this.isMiniLayout = false,
   });
 
@@ -96,7 +101,8 @@ class _AppTimerState extends State<AppTimer> {
   bool _isAlarmPlaying = false;
   TimerMode _timerMode = TimerMode.pomodoro;
   Duration _elapsedTime = const Duration(); // For stopwatch mode
-  Duration _sessionTotalElapsed = const Duration(); // Total elapsed time for the entire session
+  Duration _sessionTotalElapsed = const Duration();
+  Duration _currentWorkSessionElapsed = const Duration(); // Track current work session duration
 
   int _getTotalDurationInSeconds() {
     if (_timerMode == TimerMode.normal) {
@@ -281,10 +287,9 @@ class _AppTimerState extends State<AppTimer> {
   void _startTimer() {
     if (_isRunning || _isAlarmPlaying) return;
 
-    // Reset session total elapsed time for new session
     _sessionTotalElapsed = const Duration();
+    _currentWorkSessionElapsed = const Duration();
 
-    // Call the onTimerStart callback if provided
     widget.onTimerStart?.call();
 
     if (mounted) {
@@ -295,7 +300,6 @@ class _AppTimerState extends State<AppTimer> {
       _updateSystemTrayTimer();
       if (_tickingEnabled) _startTicking();
 
-      // Enable wakelock if the setting is enabled
       if (_keepScreenAwake) {
         _wakelockService.enable();
       }
@@ -311,28 +315,25 @@ class _AppTimerState extends State<AppTimer> {
     _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
       if (!mounted) return;
 
-      // Calculate the actual elapsed time increment for debug vs production
-      final elapsedIncrement = kDebugMode
-          ? const Duration(minutes: 1) // In debug mode, 1 minute of progress per second
-          : const Duration(seconds: 1); // In production, 1 second of progress per second
+      final elapsedIncrement = kDebugMode ? const Duration(minutes: 1) : const Duration(seconds: 1);
 
       setState(() {
         if (_timerMode == TimerMode.stopwatch) {
-          // Stopwatch mode: count up indefinitely
           _elapsedTime += elapsedIncrement;
         } else {
-          // Normal and Pomodoro modes: count down
           _remainingTime -= elapsedIncrement;
         }
       });
 
-      // Update session total elapsed time
       _sessionTotalElapsed += elapsedIncrement;
 
-      // Call onTick for UI updates (passes current elapsed/remaining time, not increments)
+      // Track current work session duration separately
+      if (_isWorking) {
+        _currentWorkSessionElapsed += elapsedIncrement;
+      }
+
       if (widget.onTick != null) {
-        final timeToDisplay = _timerMode == TimerMode.stopwatch ? _elapsedTime : _remainingTime;
-        widget.onTick!(timeToDisplay);
+        widget.onTick!(elapsedIncrement);
       }
       _updateSystemTrayTimer();
 
@@ -386,37 +387,35 @@ class _AppTimerState extends State<AppTimer> {
 
       setState(() {
         _isRunning = false;
-        _isAlarmPlaying = false; // Reset alarm state
+        _isAlarmPlaying = false;
 
         if (_timerMode == TimerMode.stopwatch) {
-          _elapsedTime = const Duration(); // Reset stopwatch
+          _elapsedTime = const Duration();
         } else {
           if (_timerMode == TimerMode.pomodoro) {
             if (!_isWorking) {
-              // If in break mode, switch back to work mode
               _isWorking = true;
             }
-            _completedSessions = 0; // Reset completed sessions
-            _isLongBreak = false; // Reset long break flag
+            _completedSessions = 0;
+            _isLongBreak = false;
           }
 
           _remainingTime = Duration(
-            seconds: _getTimeInSeconds(_workDuration), // Always set to work duration
+            seconds: _getTimeInSeconds(_workDuration),
           );
         }
 
-        // Stop timer
+        // Reset work session duration when timer stops
+        _currentWorkSessionElapsed = Duration.zero;
         _timer.cancel();
 
-        _soundManagerService.stopAll(); // Stop any playing sounds
+        _soundManagerService.stopAll();
       });
 
       _resetSystemTrayIcon();
       _removeTimerMenuItems();
-      // Reset system tray title/body when stopping timer
       _resetSystemTrayToDefault();
 
-      // Call the onTimerStop callback with total elapsed duration for the session
       if (widget.onTimerStop != null) {
         widget.onTimerStop!(_sessionTotalElapsed);
       }
@@ -437,7 +436,6 @@ class _AppTimerState extends State<AppTimer> {
     _stopAlarm();
 
     if (_timerMode == TimerMode.stopwatch) {
-      // In stopwatch mode, just restart the timer
       setState(() {
         _elapsedTime = const Duration();
       });
@@ -446,36 +444,43 @@ class _AppTimerState extends State<AppTimer> {
     }
 
     if (_timerMode == TimerMode.normal) {
-      // In normal mode, just restart the timer
       setState(() {
         _remainingTime = Duration(seconds: _getTimeInSeconds(_workDuration));
       });
       _startTimer();
       return;
     }
 
-    // Pomodoro mode logic
+    // Pass the current work session duration when work completes
+    if (_isWorking && _currentWorkSessionElapsed > Duration.zero) {
+      widget.onWorkSessionComplete?.call(_currentWorkSessionElapsed);
+    }
+
     setState(() {
       if (_isWorking) {
-        // Work session completed
         _completedSessions++;
         _isWorking = false;
         _isLongBreak = _completedSessions >= _sessionsCount;
 
         if (_isLongBreak) {
-          _completedSessions = 0; // Reset session count after long break
+          _completedSessions = 0;
         }
 
         _remainingTime = Duration(
           seconds: _getTimeInSeconds(_isLongBreak ? _longBreakDuration : _breakDuration),
         );
+
+        // Reset work session duration when starting break
+        _currentWorkSessionElapsed = Duration.zero;
       } else {
-        // Break completed, start work
         _isWorking = true;
         _isLongBreak = false;
         _remainingTime = Duration(
           seconds: _getTimeInSeconds(_workDuration),
         );
+
+        // Reset work session duration when starting new work session
+        _currentWorkSessionElapsed = Duration.zero;
       }
     });
     _startTimer();

src/lib/presentation/ui/features/tasks/constants/task_ui_constants.dart

@@ -37,6 +37,9 @@ class TaskUiConstants {
   static const int defaultEstimatedTime = 10;
   static const List<int> defaultEstimatedTimeOptions = [defaultEstimatedTime, 30, 50, 90, 120];
 
+  // Timer auto-save interval
+  static const int kPeriodicSaveIntervalSeconds = 10;
+
   // Priority Colors & Tooltips
   static Color getPriorityColor(EisenhowerPriority? priority) {
     switch (priority) {