Events spanning multiple days exceed the calendar grid

[devmount]

Describe the bug

Events that go over midnight or even span multiple days are currently not well handled.

To Reproduce

Steps to reproduce the behavior:

0. Have a calendar with a two day event, e.g. 2026-07-22 9am - 2026-07-24 3pm.
1. Go to Dashboard
2. See the event leaving the bottom of the calendar grid on the day of the event start. Also see the event not being displayed on the following day(s).

Expected behavior

As a user I would expect the event to span the whole grid, but not exceeding it. I would also expect it to display at the following days and the event block end exactly at the end time.

Actual behavior

Event block getting off-grid and not being displayed at the following days until end.

Screenshots

System

• OS: Tuxedo OS (Ubuntu 24 based)
• Zen Browser 1.21.8b (Firefox 152.0.6) (64-bit)

Additional context

This was discovered when fixing repeated events: #1678 (comment)