[scheduler] Wrong positioning for the last occurrence of a recurring event in the timeline

[rita-codes]

When we have a recurring event, the position of the last occurrence is wrong, video:

https://github.com/user-attachments/assets/06b41a2b-3f7b-4e9c-be67-5eb2009a35ee

The event time is ok, the scroll is apparently not changing, but the event is lower than expected. Not sure if this is the only scenario in which this happens.

The values in the video: Correct =>

--y-position: 4.166666714891976%;
--height: 4.166666714891976%;

Incorrect =>

--y-position: 4.347826139466499%;
--height: 4.347826139466499%;