fix: RoutePanel 상하 여백 추가 — 패널 height 76%로 축소

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/src/components/overlay/RoutePanel.tsx

@@ -228,7 +228,8 @@ export default function RoutePanel({ currentTime, visible, onSeek }: RoutePanelP
   return (
     <div
       ref={panelRef}
-      className="absolute left-0 top-0 h-full w-24 bg-black/80 border-r border-white/10 z-30"
+      className="absolute left-0 w-24 bg-black/80 border-r border-white/10 z-30"
+      style={{ top: '12%', height: '76%' }}
     >
       {/* Center vertical line */}
       <div