Initial implementation of Fantasy Hockey watchOS app

Implemented complete TCA architecture for iOS and watchOS targets:
- Authentication flow (Sign in with Apple + Yahoo OAuth)
- OAuth token management with iCloud Key-Value Storage
- Yahoo Fantasy Sports API client with async/await
- Watch Connectivity for iPhone ↔ Watch data sync
- Complete UI for both iPhone and Watch platforms

Core features:
- Matchup score display
- Category breakdown with win/loss/tie indicators
- Roster status tracking
- Manual refresh functionality
- Persistent data caching on Watch

Technical stack:
- The Composable Architecture for state management
- Swift Concurrency (async/await, actors)
- WatchConnectivity framework
- Sign in with Apple
- OAuth 2.0 authentication flow

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

FantasyWatch/FantasyWatch Watch App Watch App/Features/Matchup/CategoryBreakdownView.swift

@@ -0,0 +1,84 @@
+//
+//  CategoryBreakdownView.swift
+//  FantasyWatch Watch App
+//
+//  Created by Claude Code
+//
+
+import SwiftUI
+
+struct CategoryBreakdownView: View {
+    let categories: [CategoryScore]
+
+    var body: some View {
+        List(categories) { category in
+            HStack(spacing: 8) {
+                Text(category.name)
+                    .font(.caption)
+                    .fontWeight(.semibold)
+                    .frame(width: 40, alignment: .leading)
+
+                Spacer()
+
+                VStack(alignment: .trailing, spacing: 2) {
+                    Text(category.userValue)
+                        .font(.caption)
+                        .fontWeight(.semibold)
+                        .foregroundColor(colorForComparison(category.comparison))
+
+                    Text(category.opponentValue)
+                        .font(.caption2)
+                        .foregroundColor(.secondary)
+                }
+
+                comparisonIcon(category.comparison)
+                    .font(.caption2)
+                    .frame(width: 20)
+            }
+        }
+        .navigationTitle("Categories")
+        .navigationBarTitleDisplayMode(.inline)
+    }
+
+    private func colorForComparison(_ comparison: CategoryScore.ComparisonResult) -> Color {
+        switch comparison {
+        case .winning:
+            return .green
+        case .losing:
+            return .red
+        case .tied:
+            return .orange
+        }
+    }
+
+    @ViewBuilder
+    private func comparisonIcon(_ comparison: CategoryScore.ComparisonResult) -> some View {
+        switch comparison {
+        case .winning:
+            Image(systemName: "arrow.up")
+                .foregroundColor(.green)
+        case .losing:
+            Image(systemName: "arrow.down")
+                .foregroundColor(.red)
+        case .tied:
+            Image(systemName: "equal")
+                .foregroundColor(.orange)
+        }
+    }
+}
+
+#Preview {
+    NavigationStack {
+        CategoryBreakdownView(
+            categories: [
+                CategoryScore(statID: "1", name: "G", userValue: "10", opponentValue: "8"),
+                CategoryScore(statID: "2", name: "A", userValue: "15", opponentValue: "18"),
+                CategoryScore(statID: "3", name: "PPP", userValue: "5", opponentValue: "5"),
+                CategoryScore(statID: "4", name: "SOG", userValue: "200", opponentValue: "195"),
+                CategoryScore(statID: "5", name: "W", userValue: "3", opponentValue: "4"),
+                CategoryScore(statID: "6", name: "GAA", userValue: "2.45", opponentValue: "2.80"),
+                CategoryScore(statID: "7", name: "SV%", userValue: "0.915", opponentValue: "0.905")
+            ]
+        )
+    }
+}