Highlight current day in overview and yearly view

[domi4484]

Sometimes it would be practical to see today date at first glance on the calendar views.

I marked the PR as draft because of two points in the table view. If this feature is desirable I'll try to improve.

• I am just not super happy that the highlight is not rendered under the reservations.
• Maybe the day number should be highlighted as well. But there is already holidays and weekends color there.

Table view:

Yearly with no reservations:

Yearly with partial reservations:

Yearly with full reservations:

[developeregrem]

Hi @domi4484 again, a small but great improvement 😊
The thing with the colour behind a reservation is something i failed in the past as well. There were always some edgecases which does not work as intended 🤨
One visual thing I noticed: In the table view the cell is not highlighted while selecting cells using the mouse as shown below. This is working well in the yearly view. Maybe you can check if this will work here as well?

Furthermore some general aspects regarding the architecture:
The change works visually, but in reservation_table.html.twig it is not fully aligned with the newer table architecture. The regular reservation table is already built as a grid in ReservationTableService, so Twig should mostly render prepared DayColumn / TableCell data. The new today-highlight logic currently recalculates cell date ranges in Twig from cell.span, cell.date, and startsAtDayBoundary, which leaks the service’s half-day slot model back into the template.

A cleaner follow-up would be to move this state into the grid model, for example by adding isToday to DayColumn, or a render flag such as containsToday / isToday to TableCell, computed inside ReservationTableService. Antoher advantage is that you can write dedicated Unit tests if rendering works as intended for your use-case.

For reservation_table_month.html.twig, the change is more consistent with the current code because that yearly/month view still builds much of its table directly in Twig and does not use ReservationTableService yet.