[FTC-Events] Viewing event listings by date shows the last day of multiday events

**Describe the bug**
For events spanning multiple days, FTC-Events shows the last day of the event rather than the day the event starts when viewing the listings by date.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to https://ftc-events.firstinspires.org
2. Click on the calendar icon on a container with events spanning multiple days
3. Observe the dates

**Expected behavior**
I'd expect the date shown to be when the event starts, i.e. 2026-07-24 for FPECRI and 2026-04-29 for FTCCMP1, rather than the last day of the event.

**Screenshots**

**Device (please complete the following information):**
- OS: macOS 26.1 (25B78)
- Browser: Firefox 144.0 (aarch64)
- Version: FTC Events - v5.6.8.dirty

**Additional context**
Could be as intended 🤷🏻