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

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

src/HSchool.Content/PackPaths.cs

@@ -138,6 +138,9 @@ internal static class PackPaths
             case "affinity":
                 kind = DefKind.AffinityRules;
                 return true;
+            case "events":
+                kind = DefKind.Event;
+                return true;
             default:
                 kind = default;
                 return false;