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

Elternbeirat.Web.Tests/PocketBaseFixture.cs

@@ -338,6 +338,20 @@ public sealed class PocketBaseFixture : IAsyncLifetime
             start = "2026-11-22 08:00:00.000Z", end = "2026-11-22 12:00:00.000Z",
             title = "Herbstbasar", location = "Schulhof", note = "", @public = true,
         });
+        // Two past events (before the smoke tests' clock of 1 October 2026), so the
+        // folded-up "Vergangene Termine" section on /events has something to show:
+        // one with a time (19:00 Berlin, summer time), and one over several days
+        // without a time. All-day means 00:00 Berlin, i.e. 22:00Z the day before.
+        await CreateRecordAsync(http, "events", new
+        {
+            start = "2026-09-10 17:00:00.000Z", title = "Infoabend Klasse 5",
+            location = "Aula", note = "", @public = true,
+        });
+        await CreateRecordAsync(http, "events", new
+        {
+            start = "2026-07-19 22:00:00.000Z", end = "2026-07-21 22:00:00.000Z",
+            title = "Projekttage", location = "", note = "", @public = true,
+        });
 
         // Faq topics: two, ordered. The topics own the grouping and the order the FAQ
         // page shows the groups in (cafeteria before lockers). Titles stay German for