Fix lint errors: replace .sort() with .toSorted() and remove non-null assertion

- Replace Array#sort() with Array#toSorted() in two places (unicorn rule)
- Remove non-null assertion on Map#get(); use early continue instead

https://claude.ai/code/session_01QkFxCF4xmKjdVCNPysWDML

app/models/__tests__/scoring-event-dashboard.test.ts

@@ -298,7 +298,7 @@ describe("getEventsForDates", () => {
     const result = await getEventsForDates(["2026-03-20", "2026-03-21"]);
 
     expect(result).toHaveLength(2);
-    const displayDates = result.map((e) => e.displayDate).sort();
+    const displayDates = result.map((e) => e.displayDate).toSorted();
     expect(displayDates).toEqual(["2026-03-20", "2026-03-21"]);
     // Both entries share the same event id
     expect(result[0].id).toBe("e1");

app/models/scoring-event.ts

@@ -676,7 +676,8 @@ export async function getEventsForDates(
     if (!eventDatesMap.has(row.id)) {
       eventDatesMap.set(row.id, new Set());
     }
-    const dateSet = eventDatesMap.get(row.id)!;
+    const dateSet = eventDatesMap.get(row.id);
+    if (!dateSet) continue;
     if (row.eventDate && dates.includes(row.eventDate)) {
       dateSet.add(row.eventDate);
     }
@@ -712,7 +713,7 @@ export async function getEventsForDates(
   // Return one entry per (event, date) pair so that an event with games on
   // both today and tomorrow appears in both tabs of the dashboard widget.
   return events.flatMap((e) => {
-    const matchingDates = [...(eventDatesMap.get(e.id) ?? [])].sort();
+    const matchingDates = [...(eventDatesMap.get(e.id) ?? [])].toSorted();
     const base = {
       id: e.id,
       name: e.name,