Restructure into feature folders with code-behind and scoped CSS

Elternbeirat.Web/Features/Events/EventList.razor.cs

@@ -0,0 +1,37 @@
+using System.Globalization;
+using Elternbeirat.Web.Services;
+
+namespace Elternbeirat.Web.Features.Events;
+
+public partial class EventList
+{
+    private static readonly CultureInfo German = CultureInfo.GetCultureInfo("de-DE");
+
+    // Formats the entry's date range for display: a single day, a date with a
+    // time, or a span across days.
+    private static string Format(Event ev)
+    {
+        var start = ev.HasTime
+            ? ev.Start.ToString("dddd, d. MMMM yyyy, HH:mm", German) + " Uhr"
+            : ev.Start.ToString("dddd, d. MMMM yyyy", German);
+
+        if (ev.End is not { } end)
+        {
+            return start;
+        }
+
+        // Same day: append just the end time. Different days: append the full
+        // end date.
+        if (end.Date == ev.Start.Date)
+        {
+            return ev.HasTime
+                ? start + "–" + end.ToString("HH:mm", German) + " Uhr"
+                : start;
+        }
+
+        var endText = ev.HasTime
+            ? end.ToString("d. MMMM yyyy, HH:mm", German) + " Uhr"
+            : end.ToString("d. MMMM yyyy", German);
+        return start + " – " + endText;
+    }
+}