feat: merge event rankings and attribute badges into the page printer

Interview notes can print each student's ranked events and a shared attribute legend from the same catalog as the ranking index, without leftover table markup or collapsed answer space.

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

Core/Printing/EventAttributeMarks.cs

@@ -0,0 +1,45 @@
+using Core.Entities;
+
+namespace Core.Printing;
+
+public sealed record EventMark(
+    string Symbol,
+    string Label,
+    string Color,
+    Func<EventDefinition, bool> Applies);
+
+/// <summary>
+/// Compact event-attribute marks used on the event-ranking index chip,
+/// print badges, and the shared legend.
+/// </summary>
+public static class EventAttributeMarks
+{
+    public const string LevelOfEffort1 = "○";
+    public const string LevelOfEffort2 = "◐";
+    public const string LevelOfEffort3 = "⬤";
+    public const string Individual = "ⓘ";
+    public const string OnSite = "ⓐ";
+    public const string Regional = "ⓡ";
+    public const string Presubmission = "ⓟ";
+
+    public static readonly IReadOnlyList<EventMark> LegendItems =
+    [
+        new(LevelOfEffort1, "Level of Effort: 1", "#757575", e => e.LevelOfEffort == 1),
+        new(LevelOfEffort2, "Level of Effort: 2", "#616161", e => e.LevelOfEffort == 2),
+        new(LevelOfEffort3, "Level of Effort: 3", "#424242", e => e.LevelOfEffort == 3),
+        new(Individual, "Individual Event", "#9c27b0", e => e.EventFormat == EventFormat.Individual),
+        new(OnSite, "On-Site Activity", "#ff9800", e => e.OnSiteActivity),
+        new(Regional, "Regional Event", "#2196f3", e => e.RegionalEvent),
+        new(Presubmission, "Presubmission", "#4caf50", e => e.Presubmission)
+    ];
+
+    public static string For(EventDefinition? evt)
+    {
+        if (evt is null)
+            return string.Empty;
+
+        return string.Join(
+            " ",
+            LegendItems.Where(m => m.Applies(evt)).Select(m => m.Symbol));
+    }
+}