Refactor StateScheduleHandout component to improve event occurrence filtering and display

WebApp/Components/Features/Calendar/StateScheduleHandout.razor

@@ -106,12 +106,15 @@ else
 
         <MudContainer Class="pagebreak">
             <MudText Typo="Typo.h5" Class="mb-2">Combined schedule</MudText>
-            <MudText Typo="Typo.body2" Class="mud-text-secondary mb-3">All imported occurrences for this chapter database.</MudText>
-            @if (_allOccurrences.Count == 0)
-            {
-                <MudText Class="mud-text-secondary">No event occurrences in the database. Import a schedule from the calendar first.</MudText>
+            <MudText Typo="Typo.body2" Class="mud-text-secondary mb-3">Imported occurrences relevant to this chapter.</MudText>
+            @{
+                var combinedOccurrences = GetCombinedScheduleOccurrences().ToList();
             }
-            @foreach (var dateGroup in _allOccurrences.GroupBy(o => o.StartTime.Date))
+            @if (combinedOccurrences.Count == 0)
+            {
+                <MudText Class="mud-text-secondary">No relevant event occurrences found for your current team registrations.</MudText>
+            }
+            @foreach (var dateGroup in combinedOccurrences.GroupBy(o => o.StartTime.Date))
             {
                 <MudText Typo="Typo.subtitle2" Class="mt-2 mb-1">@FormatDateHeading(dateGroup.Key)</MudText>
                 <MudSimpleTable Dense="true" Class="state-schedule-table mb-3">
@@ -242,6 +245,21 @@ else
             .DistinctBy(o => (o.StartTime, o.Name ?? ""));
     }
 
+    private IEnumerable<EventOccurrence> GetCombinedScheduleOccurrences()
+    {
+        return _allOccurrences!
+            .Where(o =>
+            {
+                // Keep chapter-wide/special schedule rows.
+                if (!o.EventDefinitionId.HasValue)
+                    return true;
+
+                // Keep only competition events where this chapter has registered teams.
+                return _teamsByEventDefinitionId.TryGetValue(o.EventDefinitionId.Value, out var teams) && teams.Count > 0;
+            })
+            .OrderBy(o => o.StartTime);
+    }
+
     private IEnumerable<EventSummaryRow> GetEventSummaryRows(Student student)
     {
         foreach (var team in student.Teams.OrderBy(t => t.Event.Name))