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/GameCenterView.swift

@@ -21,7 +21,22 @@ struct GameCenterView: View {
                     atBatPanel(feed: feed)
                 }
 
-                if let wpHome = viewModel.winProbabilityHome, let wpAway = viewModel.winProbabilityAway {
+                // Pitch Arsenal for current pitcher
+                if let pitcherName = feed.currentPitcher?.fullName {
+                    PitchArsenalView(
+                        allPlays: feed.liveData.plays.allPlays,
+                        pitcherName: pitcherName
+                    )
+                }
+
+                // Win Probability Chart (full game timeline)
+                if !viewModel.winProbabilityHistory.isEmpty {
+                    WinProbabilityChartView(
+                        entries: viewModel.winProbabilityHistory,
+                        homeCode: game.homeTeam.code,
+                        awayCode: game.awayTeam.code
+                    )
+                } else if let wpHome = viewModel.winProbabilityHome, let wpAway = viewModel.winProbabilityAway {
                     winProbabilityPanel(home: wpHome, away: wpAway)
                 }