Restore consistent RMB display and stable image-studio option state after save

Constraint: Fix the visible regressions without changing the broader pricing model or image-studio backend contract.
Rejected: Ad hoc page-specific symbol patches | would leave model-pricing views inconsistent and fragile.
Confidence: high
Scope-risk: narrow
Directive: Keep model-pricing summaries on shared currency formatting and keep dynamic image-studio model controls fully controlled after save.
Tested: cd web && NODE_OPTIONS='--max-old-space-size=4096' npm run build
Not-tested: Browser-click verification on the live model plaza and image-studio settings form.

web/src/helpers/utils.jsx

@@ -880,7 +880,7 @@ export const formatPriceInfo = (priceData, t, quotaDisplayType = 'USD') => {
     <>
       {items.map((item) => (
         <span key={item.key} style={{ color: 'var(--semi-color-text-1)' }}>
-          {item.label} {item.value}
+          {item.label} {formatPriceItemValue(item, quotaDisplayType)}
           {item.suffix}
         </span>
       ))}
@@ -888,6 +888,50 @@ export const formatPriceInfo = (priceData, t, quotaDisplayType = 'USD') => {
   );
 };
 
+export const formatPriceItemValue = (item, quotaDisplayType = 'USD') => {
+  if (!item) {
+    return '-';
+  }
+
+  const rawValue = item.value;
+  if (rawValue === null || rawValue === undefined || rawValue === '') {
+    return '-';
+  }
+
+  if (quotaDisplayType === 'TOKENS' || String(item.suffix || '').includes('x')) {
+    return rawValue;
+  }
+
+  const statusStr = localStorage.getItem('status');
+  let symbol = '￥';
+  let rate = 1;
+
+  if (quotaDisplayType === 'CNY' || quotaDisplayType === 'USD') {
+    symbol = '￥';
+    try {
+      if (statusStr) {
+        const status = JSON.parse(statusStr);
+        rate = status?.usd_exchange_rate || 7;
+      }
+    } catch {}
+  } else if (quotaDisplayType === 'CUSTOM') {
+    try {
+      if (statusStr) {
+        const status = JSON.parse(statusStr);
+        symbol = status?.custom_currency_symbol || '¤';
+        rate = status?.custom_currency_exchange_rate || 1;
+      }
+    } catch {}
+  }
+
+  const numericValue = Number(rawValue);
+  if (!Number.isFinite(numericValue)) {
+    return `${symbol}${rawValue}`;
+  }
+
+  return `${symbol}${Number((numericValue * rate).toFixed(6))}`;
+};
+
 // -------------------------------
 // CardPro 分页配置函数
 // 用于创建 CardPro 的 paginationArea 配置