fix: query nominators from Asset Hub, treasury balances from both chains

NetworkStats now queries staking.nominators from Asset Hub instead of
Relay Chain (staking migrated to AH). Treasury hook fetches HEZ from RC
and PEZ from AH (asset 1) for accurate balance display.

web/src/components/treasury/TreasuryOverview.tsx

@@ -77,7 +77,7 @@ export const TreasuryOverview: React.FC = () => {
           {t('treasury.liveData')}
         </Badge>
         <span className="text-sm text-muted-foreground">
-          {t('treasury.activeProposals', { count: proposals.length })} • {t('treasury.hezInTreasury', { amount: metrics.totalBalance.toFixed(2) })}
+          {t('treasury.activeProposals', { count: proposals.length })} • {metrics.pezBalance.toLocaleString(undefined, { maximumFractionDigits: 2 })} PEZ • {metrics.hezBalance.toLocaleString(undefined, { maximumFractionDigits: 4 })} HEZ
         </span>
       </div>
 
@@ -117,7 +117,8 @@ export const TreasuryOverview: React.FC = () => {
             <div className="flex items-center justify-between">
               <div>
                 <p className="text-sm text-muted-foreground">{t('treasury.totalBalance')}</p>
-                <p className="text-2xl font-bold">${(metrics.totalBalance / 1000000).toFixed(2)}M</p>
+                <p className="text-lg font-bold">{metrics.pezBalance.toLocaleString(undefined, { maximumFractionDigits: 2 })} PEZ</p>
+                <p className="text-sm font-semibold text-muted-foreground">{metrics.hezBalance.toLocaleString(undefined, { maximumFractionDigits: 4 })} HEZ</p>
                 <p className="text-xs text-green-500 flex items-center mt-1">
                   <ArrowUpRight className="h-3 w-3 mr-1" />
                   {t('treasury.thisMonth', { percent: '12.5' })}