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/ViewModels/LeagueCenterViewModel.swift

@@ -7,6 +7,8 @@ final class LeagueCenterViewModel {
     var scheduleGames: [StatsGame] = []
     var standings: [StandingsDivisionRecord] = []
     var teams: [LeagueTeamSummary] = []
+    var leagueLeaders: [LeaderCategory] = []
+    var isLoadingLeaders = false
 
     var selectedTeam: TeamProfile?
     var roster: [RosterPlayerSummary] = []
@@ -21,6 +23,7 @@ final class LeagueCenterViewModel {
     var playerErrorMessage: String?
 
     private let statsAPI = MLBStatsAPI()
+    private let webService = MLBWebDataService()
     private(set) var scheduleDate = Date()
 
     private var seasonString: String {
@@ -56,6 +59,19 @@ final class LeagueCenterViewModel {
         }
 
         isLoadingOverview = false
+
+        // Load leaders in the background
+        Task { await loadLeaders() }
+    }
+
+    func loadLeaders() async {
+        isLoadingLeaders = true
+        do {
+            leagueLeaders = try await webService.fetchLeagueLeaders()
+        } catch {
+            // Leaders are supplementary
+        }
+        isLoadingLeaders = false
     }
 
     func goToPreviousDay() async {