fix: apply formatNumber to adventurer, upgrade, and prestige panels

All cost/stat displays now respect the player's chosen number notation
format instead of rendering raw numbers or toLocaleString values.

apps/web/src/components/game/PrestigePanel.tsx

@@ -5,7 +5,7 @@ import { useGame } from "../../context/GameContext.js";
 const PRESTIGE_THRESHOLD = 1_000_000;
 
 export const PrestigePanel = (): React.JSX.Element => {
-  const { state, reload } = useGame();
+  const { state, reload, formatNumber } = useGame();
   const [characterName, setCharacterName] = useState("");
   const [isPending, setIsPending] = useState(false);
   const [result, setResult] = useState<{ runestones: number; count: number } | null>(null);
@@ -42,10 +42,10 @@ export const PrestigePanel = (): React.JSX.Element => {
       <div className="prestige-status">
         <p>
           Total gold earned:{" "}
-          <strong>{state.player.totalGoldEarned.toLocaleString()}</strong>
+          <strong>{formatNumber(state.player.totalGoldEarned)}</strong>
         </p>
         <p>
-          Required: <strong>{PRESTIGE_THRESHOLD.toLocaleString()}</strong>
+          Required: <strong>{formatNumber(PRESTIGE_THRESHOLD)}</strong>
         </p>
         <p>Current prestige count: <strong>{state.prestige.count}</strong></p>
         <p>
@@ -82,7 +82,7 @@ export const PrestigePanel = (): React.JSX.Element => {
         </div>
       ) : (
         <p className="prestige-locked">
-          Earn {(PRESTIGE_THRESHOLD - state.player.totalGoldEarned).toLocaleString()} more
+          Earn {formatNumber(PRESTIGE_THRESHOLD - state.player.totalGoldEarned)} more
           gold to unlock prestige.
         </p>
       )}