feat adds proper syncing feature

Signed-off-by: Menno van Leeuwen <menno@vleeuwen.me>

lib/widgets/supplement_card.dart

@@ -42,7 +42,7 @@ class _SupplementCardState extends State<SupplementCard> {
               final unitsTaken = intake['unitsTaken'] ?? 1.0;
               return {
                 'time': '${takenAt.hour.toString().padLeft(2, '0')}:${takenAt.minute.toString().padLeft(2, '0')}',
-                'units': unitsTaken,
+                'units': unitsTaken is int ? unitsTaken.toDouble() : unitsTaken as double,
               };
             }).toList();