refactor(guides) : consolidate duplicate guide and Stygian logic

components/stygian/stygian-boss-display.tsx

@@ -11,6 +11,7 @@ import {
 import { Card, CardContent } from "@/components/ui/card";
 import { LunarisText } from "@/components/public/lunaris-text";
 import { parseLunarisText } from "@/lib/catalog/lunaris";
+import { stygianBossPositionLabels } from "@/lib/stygian/constants";
 
 export type StygianBossDisplay = {
   name: string;
@@ -71,7 +72,7 @@ export function StygianBossTab({
   position: number;
   priority?: boolean;
 }) {
-  const positionLabel = ["บน", "กลาง", "ล่าง"][position];
+  const positionLabel = stygianBossPositionLabels[position];
   return (
     <>
       {boss ? (