Add EventDef notices, morning and lesson bells, and info toasts.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/HSchool.Server/Game/SchoolWorker.Tick.cs

@@ -165,6 +165,7 @@ internal sealed partial class SchoolWorker
                 {
                     PublishSnapshot();
                     BroadcastClock();
+                    EmitWorldEvents(school);
                     MaybeBroadcastPresence(school);
                 }
 
@@ -244,6 +245,7 @@ internal sealed partial class SchoolWorker
         PublishSnapshot();
         Persist();
         BroadcastClock();
+        EmitWorldEvents(school);
         BroadcastPresence();
         _presenceAge = 0;
     }
@@ -489,4 +491,48 @@ internal sealed partial class SchoolWorker
         var length = ProtocolCodec.WritePresence(frame, message);
         client.TrySendReliable(frame.AsMemory(0, length));
     }
+
+    private void EmitWorldEvents(School school)
+    {
+        var catalog = school.Catalog;
+        if (catalog is null)
+        {
+            school.DrainWorldEvents();
+            return;
+        }
+
+        foreach (var fact in school.DrainWorldEvents())
+        {
+            foreach (var def in catalog.Events.Values)
+            {
+                if (def.Abstract
+                    || !def.Trigger.Equals(fact.Trigger, StringComparison.Ordinal)
+                    || !def.Severity.Equals(EventSeverities.Info, StringComparison.Ordinal))
+                {
+                    continue;
+                }
+
+                BroadcastNotice(new ServerNoticeMessage(
+                    ++_nextNoticeId,
+                    def.DefName,
+                    NoticeSeverity.Info,
+                    def.Pause,
+                    (uint)Math.Max(0, def.TtlMs)));
+            }
+        }
+    }
+
+    private void BroadcastNotice(in ServerNoticeMessage message)
+    {
+        var frame = new byte[ProtocolCodec.NoticeSize(message)];
+        var length = ProtocolCodec.WriteNotice(frame, message);
+        var payload = frame.AsMemory(0, length);
+        foreach (var client in _clients.All)
+        {
+            if (client.IsReady && client.OpenSchoolId == _id)
+            {
+                client.TrySendReliable(payload);
+            }
+        }
+    }
 }