Add UI redesign: design system, dashboard density, game intelligence, feed tab, league leaders

Phase 1 - Design System: DesignSystem.swift (typography, colors, spacing
constants) and DataPanel.swift (reusable panel container with 3 densities
and optional team accent bar).

Phase 2 - Dashboard Density: LiveSituationBar (compact strip of all live
games with scores/innings/outs), MiniLinescoreView (R-H-E footer for game
cards), DiamondView (visual baseball diamond with runners and count).
Dashboard shows live situation bar when games are active. Game cards now
display mini linescore for live/final games.

Phase 3 - Game Center Intelligence: WinProbabilityChartView (full-game
line chart using Swift Charts with area fills), PitchArsenalView (pitch
type distribution with velocity bars). GameCenterViewModel now stores
full WP history array instead of just latest values.

Phase 4 - Feed Tab: MLBWebDataService (fetches league leaders from Stats
API, news headlines, transactions), FeedViewModel, FeedView with
reverse-chronological feed items. FeedItemView with colored edge bars
by category. Added 5th "Feed" tab to both tvOS and iOS.

Phase 5 - Intel Tab: LeaderboardView (top-5 stat cards with headshots),
integrated into LeagueCenterView. Renamed tabs: Games->Today,
League->Intel. LeagueCenterViewModel now fetches league leaders.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mlbTVOS/Views/LeagueCenterView.swift

@@ -36,6 +36,12 @@ struct LeagueCenterView: View {
 
                 scheduleSection
                 standingsSection
+
+                // League Leaders
+                if !viewModel.leagueLeaders.isEmpty {
+                    leadersSection
+                }
+
                 teamsSection
 
                 if let selectedTeam = viewModel.selectedTeam {
@@ -214,6 +220,41 @@ struct LeagueCenterView: View {
         .frame(maxWidth: .infinity, alignment: alignTrailing ? .trailing : .leading)
     }
 
+    private var leadersSection: some View {
+        VStack(alignment: .leading, spacing: 18) {
+            HStack {
+                Text("League Leaders")
+                    .font(.system(size: 30, weight: .bold, design: .rounded))
+                    .foregroundStyle(.white)
+
+                Spacer()
+
+                if viewModel.isLoadingLeaders {
+                    ProgressView()
+                }
+            }
+
+            ScrollView(.horizontal) {
+                LazyHStack(spacing: DS.Spacing.cardGap) {
+                    ForEach(viewModel.leagueLeaders) { category in
+                        LeaderboardView(category: category)
+                            .frame(width: leaderCardWidth)
+                    }
+                }
+                .padding(.vertical, 8)
+            }
+            .scrollClipDisabled()
+        }
+    }
+
+    private var leaderCardWidth: CGFloat {
+        #if os(tvOS)
+        380
+        #else
+        280
+        #endif
+    }
+
     private var standingsSection: some View {
         VStack(alignment: .leading, spacing: 18) {
             Text("Standings")