Frontend alignment with backend WebSocket protocol:
**Type System Fixes**:
- types/game.ts: Changed DecisionPhase to use 'awaiting_*' convention matching backend
- types/game.ts: Fixed PlayOutcome enum values to match backend string values (e.g., 'strikeout' not 'STRIKEOUT')
- types/game.ts: Added comprehensive play outcome types (groundball_a/b/c, flyout variants, x_check)
**Decision Detection**:
- store/game.ts: Updated decision detection to check both decision prompt AND gameState.decision_phase
- components: Updated all decision phase checks to use 'awaiting_defensive', 'awaiting_offensive', 'awaiting_stolen_base'
**WebSocket Enhancements**:
- useWebSocket.ts: Added game_joined event handler with success toast
- useWebSocket.ts: Fixed dice roll data - now receives d6_two_a and d6_two_b from server
- useWebSocket.ts: Request fresh game state after decision submissions to sync decision_phase
**New Constants**:
- constants/outcomes.ts: Created centralized PlayOutcome enum with display labels and descriptions
**Testing**:
- Updated test expectations for new decision phase naming
- All component tests passing
**Why**:
Eliminates confusion from dual naming conventions. Frontend now uses same vocabulary as backend.
Fixes runtime type errors from enum value mismatches.
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Co-Authored-By: Claude <noreply@anthropic.com>
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