fix: Dashboard 余额/已使用金额保留两位小数

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/Dashboard.jsx

@@ -59,7 +59,7 @@ export default function Dashboard() {
         <div className="glass rounded-2xl p-6">
           <p className="text-sm text-page-secondary mb-2">{t('dashboard.balance')}</p>
           <div className="text-3xl font-bold text-page">
-            {symbol}<CountUp from={0} to={balanceDollars} duration={1.5} />
+            {symbol}<CountUp from={0} to={Math.round(balanceDollars * 100) / 100} duration={1.5} />
           </div>
           <p className="text-xs text-page-muted mt-1">{t('dashboard.quotaUnits', { count: quota.toLocaleString() })}</p>
         </div>
@@ -67,7 +67,7 @@ export default function Dashboard() {
         <div className="glass rounded-2xl p-6">
           <p className="text-sm text-page-secondary mb-2">{t('dashboard.used')}</p>
           <div className="text-3xl font-bold text-page">
-            {symbol}<CountUp from={0} to={usedQuota / Q * rate} duration={1.5} />
+            {symbol}<CountUp from={0} to={Math.round(usedQuota / Q * rate * 100) / 100} duration={1.5} />
           </div>
           <p className="text-xs text-page-muted mt-1">{t('dashboard.quotaUnits', { count: usedQuota.toLocaleString() })}</p>
         </div>