fix(complement-race): flip AI racers to face right in practice mode

Adds horizontal flip (scaleX(-1)) to AI racer icons in LinearTrack so they face the correct direction (right) when racing.

CircularTrack doesn't need this fix as racers are already rotated to face the direction they're traveling around the track.

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

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

apps/web/src/app/arcade/complement-race/components/RaceTrack/LinearTrack.tsx

@@ -132,7 +132,7 @@ export function LinearTrack({
               position: 'absolute',
               left: `${aiPosition}%`,
               top: `${35 + index * 15}%`,
-              transform: 'translate(-50%, -50%)',
+              transform: 'translate(-50%, -50%) scaleX(-1)',
               fontSize: '28px',
               transition: 'left 0.2s linear',
               filter: 'drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2))',