fix(complement-race): show new passengers when route changes

Fixed bug where passengers wouldn't appear after completing a route.

Problem: When a new route started, the Provider reset trainPosition to 0,
but useTrackManagement was checking `trainPosition < 0` to detect resets.
Since 0 is not < 0, the condition failed and passengers didn't update.

Root cause:
1. Route completes, train at position ~107%
2. Client dispatches START_NEW_ROUTE with routeNumber=2
3. Server validates and broadcasts new state (route=2, new passengers)
4. Provider resets clientPosition to 0
5. useTrackManagement checks:
   - trainReset = trainPosition < 0 → FALSE (0 is not < 0!)
   - sameRoute = currentRoute === displayRouteRef.current → FALSE (2 !== 1)
6. Neither condition met, so displayPassengers doesn't update

Solution: Changed trainReset condition from `trainPosition < 0` to
`trainPosition <= 0` to treat position 0 as a reset. Also updated
the pending track application logic with the same fix.

Now passengers appear immediately when a new route starts.

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

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

apps/web/src/app/arcade/complement-race/hooks/useTrackManagement.ts

@@ -67,7 +67,7 @@ export function useTrackManagement({
 
   // Apply pending track when train resets to beginning
   useEffect(() => {
-    if (pendingTrackData && trainPosition < 0) {
+    if (pendingTrackData && trainPosition <= 0) {
       setTrackData(pendingTrackData)
       previousRouteRef.current = currentRoute
       setPendingTrackData(null)
@@ -77,9 +77,9 @@ export function useTrackManagement({
   // Manage passenger display during route transitions
   useEffect(() => {
     // Only switch to new passengers when:
-    // 1. Train has reset to start position (< 0) - track has changed, OR
+    // 1. Train has reset to start position (<= 0) - track has changed, OR
     // 2. Same route AND (in middle of track OR passengers have changed state)
-    const trainReset = trainPosition < 0
+    const trainReset = trainPosition <= 0
     const sameRoute = currentRoute === displayRouteRef.current
     const inMiddleOfTrack = trainPosition >= 10 && trainPosition < 90 // Avoid start/end transition zones