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/Components/DataPanel.swift

@@ -0,0 +1,69 @@
+import SwiftUI
+
+enum DataPanelDensity {
+    case compact
+    case standard
+    case featured
+
+    var padding: CGFloat {
+        switch self {
+        case .compact: DS.Spacing.panelPadCompact
+        case .standard: DS.Spacing.panelPadStandard
+        case .featured: DS.Spacing.panelPadFeatured
+        }
+    }
+
+    var cornerRadius: CGFloat {
+        switch self {
+        case .compact: DS.Radii.compact
+        case .standard: DS.Radii.standard
+        case .featured: DS.Radii.featured
+        }
+    }
+}
+
+struct DataPanel<Content: View>: View {
+    let density: DataPanelDensity
+    var teamAccentCode: String? = nil
+    @ViewBuilder let content: () -> Content
+
+    var body: some View {
+        HStack(spacing: 0) {
+            if let code = teamAccentCode {
+                RoundedRectangle(cornerRadius: 1.5)
+                    .fill(TeamAssets.color(for: code))
+                    .frame(width: 3)
+                    .padding(.vertical, 6)
+                    .padding(.leading, 4)
+            }
+
+            VStack(alignment: .leading, spacing: 0) {
+                content()
+            }
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .padding(density.padding)
+        }
+        .background(
+            RoundedRectangle(cornerRadius: density.cornerRadius)
+                .fill(DS.Colors.panelFill)
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: density.cornerRadius)
+                .strokeBorder(DS.Colors.panelStroke, lineWidth: 0.5)
+        )
+    }
+}
+
+// MARK: - Convenience initializers
+
+extension DataPanel {
+    init(
+        _ density: DataPanelDensity = .standard,
+        teamAccent: String? = nil,
+        @ViewBuilder content: @escaping () -> Content
+    ) {
+        self.density = density
+        self.teamAccentCode = teamAccent
+        self.content = content
+    }
+}