feat(schedule): group games by sport instead of date

Games in schedule view now display in sport sections (MLB, NBA, etc.)
with games sorted by date within each section. Each game row shows its
date since the section header now shows sport instead.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTime/Features/Schedule/ViewModels/ScheduleViewModel.swift

@@ -50,6 +50,21 @@ final class ScheduleViewModel {
         return grouped.sorted { $0.key < $1.key }.map { ($0.key, $0.value) }
     }
 
+    var gamesBySport: [(sport: Sport, games: [RichGame])] {
+        let grouped = Dictionary(grouping: filteredGames) { game in
+            game.game.sport
+        }
+        // Sort by sport order (use allCases index for consistent ordering)
+        // Within each sport, games are sorted by date
+        return grouped
+            .sorted { lhs, rhs in
+                let lhsIndex = Sport.allCases.firstIndex(of: lhs.key) ?? 0
+                let rhsIndex = Sport.allCases.firstIndex(of: rhs.key) ?? 0
+                return lhsIndex < rhsIndex
+            }
+            .map { (sport: $0.key, games: $0.value.sorted { $0.game.dateTime < $1.game.dateTime }) }
+    }
+
     var hasFilters: Bool {
         selectedSports.count < Sport.supported.count || !searchText.isEmpty
     }