fix: prevent route celebration from immediately reappearing

Fixed race condition where route celebration modal would immediately
reappear after clicking 'Continue Journey'.

Root cause: trainPosition stayed >= 100 while showRouteCelebration
was toggled, causing the interval check to re-trigger COMPLETE_ROUTE.

Solution:
1. START_NEW_ROUTE now resets showRouteCelebration to false
2. Removed setTimeout delay and HIDE_ROUTE_CELEBRATION action
3. Single atomic state update prevents race condition

Now continuing to next route works smoothly without modal flickering.

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

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

apps/web/src/app/games/complement-race/components/GameDisplay.tsx

@@ -162,21 +162,16 @@ export function GameDisplay() {
   const handleContinueToNextRoute = () => {
     const nextRoute = state.currentRoute + 1
 
-    // Hide celebration
-    dispatch({ type: 'HIDE_ROUTE_CELEBRATION' })
+    // Start new route (this also hides celebration)
+    dispatch({
+      type: 'START_NEW_ROUTE',
+      routeNumber: nextRoute,
+      stations: state.stations // Keep same stations for now
+    })
 
-    // Generate new track and passengers for next route
-    setTimeout(() => {
-      dispatch({
-        type: 'START_NEW_ROUTE',
-        routeNumber: nextRoute,
-        stations: state.stations // Keep same stations for now
-      })
-
-      // Generate new passengers
-      const newPassengers = generatePassengers(state.stations)
-      dispatch({ type: 'GENERATE_PASSENGERS', passengers: newPassengers })
-    }, 100)
+    // Generate new passengers
+    const newPassengers = generatePassengers(state.stations)
+    dispatch({ type: 'GENERATE_PASSENGERS', passengers: newPassengers })
   }
 
   if (!state.currentQuestion) return null

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

@@ -375,7 +375,8 @@ function gameReducer(state: GameState, action: GameAction): GameState {
         currentRoute: action.routeNumber,
         stations: action.stations,
         trainPosition: 0,
-        deliveredPassengers: 0
+        deliveredPassengers: 0,
+        showRouteCelebration: false
       }
 
     case 'COMPLETE_ROUTE':