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/DashboardView.swift

@@ -121,6 +121,25 @@ struct DashboardView: View {
                     }
                     .padding(.top, 80)
                 } else {
+                    // Live situation bar — compact strip of all live games
+                    if !viewModel.liveGames.isEmpty {
+                        VStack(alignment: .leading, spacing: 12) {
+                            HStack(spacing: 8) {
+                                LiveIndicator()
+                                Text("LIVE NOW")
+                                    .font(DS.Fonts.caption)
+                                    .foregroundStyle(DS.Colors.live)
+                                    .kerning(1.5)
+                            }
+                            .padding(.horizontal, 4)
+
+                            LiveSituationBar(games: viewModel.liveGames) { game in
+                                selectedGame = game
+                            }
+                            .padding(.horizontal, -horizontalPadding)
+                        }
+                    }
+
                     // Hero featured game
                     if let featured = viewModel.featuredGame {
                         FeaturedGameCard(game: featured) {
@@ -427,19 +446,22 @@ struct DashboardView: View {
     }
 
     @ViewBuilder
-    private func statPill(_ value: String, label: String, color: Color = .blue) -> some View {
+    private func statPill(_ value: String, label: String, color: Color = DS.Colors.interactive) -> some View {
         VStack(spacing: 2) {
             Text(value)
-                .font(.title3.weight(.bold).monospacedDigit())
+                .font(DS.Fonts.dataValue)
                 .foregroundStyle(color)
             Text(label)
-                .font(.subheadline.weight(.medium))
-                .foregroundStyle(.secondary)
+                .dataLabelStyle()
         }
         .padding(.horizontal, 20)
         .padding(.vertical, 10)
-        .background(.regularMaterial)
-        .clipShape(RoundedRectangle(cornerRadius: 14))
+        .background(DS.Colors.panelFill)
+        .overlay(
+            RoundedRectangle(cornerRadius: DS.Radii.compact)
+                .strokeBorder(DS.Colors.panelStroke, lineWidth: 0.5)
+        )
+        .clipShape(RoundedRectangle(cornerRadius: DS.Radii.compact))
     }
 
     // MARK: - Featured Channels