Add post and event cards, shared calendar sheet and per-event ICS; rework past events and next-event card

Elternbeirat.Web/Features/Home/Home.razor.cs

@@ -46,14 +46,6 @@ public partial class Home
     private IReadOnlyList<string> _embed = [];
     private Event? _nextEvent;
 
-    // Month and day for the calendar sheet. The sheet is decoration (the full date is
-    // in <EventDate> next to it), so the short month drops its trailing period.
-    private string NextEventMonth =>
-        _nextEvent?.Start.ToString("MMM", Cultures.German).TrimEnd('.') ?? "";
-
-    private string NextEventDay =>
-        _nextEvent?.Start.Day.ToString(Cultures.German) ?? "";
-
     protected override Task OnInitializedAsync()
     {
         var token = HttpContext?.RequestAborted ?? CancellationToken.None;