Extract date rendering into per-feature Date components

Elternbeirat.Web/Features/Embeds/EventsEmbed.razor.cs

@@ -25,7 +25,7 @@ public partial class EventsEmbed
     [CascadingParameter]
     private HttpContext? HttpContext { get; set; }
 
-    private IReadOnlyList<Event> _upcoming = [];
+    private IReadOnlyList<Event> _upcomingEvents = [];
 
     protected override async Task OnInitializedAsync()
     {
@@ -45,7 +45,7 @@ public partial class EventsEmbed
         // Teaser: the soonest upcoming events, earliest first. An event earlier
         // today still counts as upcoming.
         var today = DateOnly.FromDateTime(DateTime.Today);
-        _upcoming =
+        _upcomingEvents =
         [
             .. events
                 .Where(@event => DateOnly.FromDateTime(@event.Start) >= today)