feat: Overview dashboard from the Claude Design v2 handoff

Pre-deploy: live WP + shot maps, assisted share, AST/REB analysis, team selectors everywhere

Phase 4: lineup explorer + possession engine

Phase 3: team identity, opponent scouting, matchup, shot map

Phase 2: Player Analyzer — percentile radar, lineup-based on/off

Phase 0: project scaffold, nba_api client, HF Spaces setup