Ensure the Nearest Upcoming Event Is Displayed First

[yuhattor]

Overview

Previously, the logic for displaying upcoming events could result in the most distant future event being shown. This PR fixes that behavior by ensuring the nearest upcoming event is always displayed.

Changes

• Modified the logic to use $futureEvents.ByDate to sort upcoming events in ascending order by date
• Now displays the first event in the list (i.e., the soonest upcoming event)

Affected files:

• layouts/shortcodes/upcoming-event-card.html
• layouts/partials/header.html

How to Test

1. Create multiple upcoming events in the content directory (e.g., an existing event on 2025-05-06 and others with later dates)
2. Serve the website locally
3. Verify that the event with the nearest future date is the one displayed