fix: prevent layout shift when selecting Steam Sprint mode

Remove conditional padding that caused 12px upward shift when
selecting Steam Sprint. Now uses consistent 20px 8px padding
across all game modes for stable layout.

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

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

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

@@ -16,7 +16,7 @@ export function ComplementRaceGame() {
       display: 'flex',
       flexDirection: 'column',
       overflow: 'hidden',
-      padding: state.style === 'sprint' ? '8px' : '20px 8px',
+      padding: '20px 8px',
       minHeight: '100vh',
       maxHeight: '100vh',
       background: state.style === 'sprint'