Some activities are hidden and others are wrongly groupped

See [Jasło Cubing Days 2026](https://www.competitiongroups.com/competitions/JasloCubingDays2026/activities) (but this is not the only competition with those bugs).

Some activities (like lunch, awards etc) aren't visible in the Schedule tab. Some others (like check-in) has wrong start and end times listed (see image below). My guess is that they're grouped by their activity code which is the same (`other-misc`).

Also, I personally really liked the previous version with activity start and end times listed just below the title, not on the right side (see image below), but that's just my personal opinion

Reproduce the issue on the Jasło Cubing Days 2026 activities page and inspect the Schedule tab, focusing on how activities with the `other-misc` code are grouped. Compare the displayed activities and times with the linked competition page and screenshots. Done means lunch, awards, check-in, and other activities appear individually with their correct start and end times.

索引モデルが issue の本文から書いたものです。