fix: align PNL0001 symbol causality

frontend/src/componentSymbols/pneumatic.tsx

@@ -205,11 +205,11 @@ export function AmesimPnl00rSymbol() {
   );
 }
 
-/** C-R dynamic pneumatic line (AMESim PNL0001). */
+/** C-R dynamic pneumatic line (AMESim PNL0001): port 1 is R, port 2 is C. */
 export function AmesimPnl0001Symbol() {
   return (
     <SymbolSvg className="component-symbol-amesim-pnl0001-svg" domain="pneumatic">
-      <PipeNetworkBody sections={["C", "R"]} />
+      <PipeNetworkBody sections={["R", "C"]} />
     </SymbolSvg>
   );
 }