better positioning, fixed endless workout

lib/providers/workout_provider.dart

@@ -67,6 +67,7 @@ class WorkoutProvider extends ChangeNotifier {
       });
     } else {
       _audioPlayer.play(_finishedSoundSource);
+      stopWorkout();
     }
   }
 

lib/widgets/workout_timer_widget.dart

@@ -23,10 +23,26 @@ class WorkoutTimerWidget extends StatelessWidget {
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
         Text(workoutProvider.currentPhase),
-        CircularProgressIndicator(
-            value: timerProvider.elapsedSeconds /
-                workoutProvider.currentPhaseDuration.inSeconds),
+        const SizedBox(
+          height: 20,
+        ),
+        Stack(
+          alignment: Alignment.center,
+          children: [
+            SizedBox(
+                height: 100,
+                width: 100,
+                child: CircularProgressIndicator(
+                    value: (workoutProvider.currentPhaseDuration.inSeconds
+                                .toDouble() -
+                            timerProvider.elapsedSeconds) /
+                        workoutProvider.currentPhaseDuration.inSeconds)),
             TimerWidget(duration: workoutProvider.currentPhaseDuration),
+          ],
+        ),
+        const SizedBox(
+          height: 20,
+        ),
         ElevatedButton(
             onPressed: !workoutProvider.isWorkoutStarted
                 ? () => workoutProvider.startWorkout()