feat(center-graphic): tunnel and bridge section shapes in simple examples

- CompactFacilityConnection gets an optional segmentShape ('tunnel' |
  'bridge'); omitted keeps the narrow centre strip
- Tunnel: 30% rounded section with a white outline and a dot on each end
- Bridge: 30% square section with white end lines and a square mark at
  each end

packages/center-graphic/src/components/TunnelFacility.tsx

@@ -168,7 +168,7 @@ function TunnelSample({ title, note, children }: { title: string; note?: string;
 
 function CompactTunnelExample() {
   return (
-    <CompactFacilityConnection className="tunnel-applied-example" routeMode="inline" sourceStatus="SOURCE_RECEIVED" label="노선과 터널 시설물의 간략 적용 예제">
+    <CompactFacilityConnection className="tunnel-applied-example" routeMode="inline" segmentShape="tunnel" sourceStatus="SOURCE_RECEIVED" label="노선과 터널 시설물의 간략 적용 예제">
       <TunnelFacility name="대산2터널" secondaryText="L=750m" variant="positionMap" />
     </CompactFacilityConnection>
   );