fix: reset momentum and pressure when starting new route

Added momentum and pressure reset to START_NEW_ROUTE action.
Each new route now starts fresh with zero momentum/pressure,
preventing carryover from the previous route.

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

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

apps/web/src/app/games/complement-race/context/ComplementRaceContext.tsx

@@ -376,7 +376,9 @@ function gameReducer(state: GameState, action: GameAction): GameState {
         stations: action.stations,
         trainPosition: 0,
         deliveredPassengers: 0,
-        showRouteCelebration: false
+        showRouteCelebration: false,
+        momentum: 0,
+        pressure: 0
       }
 
     case 'COMPLETE_ROUTE':