Add complete game results tracking and scoreboard system:
- Database schema: Add game_results table for storing game outcomes
- API endpoints: Add routes for saving results, player history, and
classroom leaderboards
- React Query hooks: Add usePlayerGameHistory, usePlayerClassroomRank,
useSaveGameResult
- ScoreboardTab: New dashboard tab showing personal bests, recent games,
and classroom rankings
- GameBreakResultsScreen: Interstitial showing results after game breaks
- Integration: Save game results when matching game completes, display
results before returning to practice
Includes Storybook stories and unit tests for both components.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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