diff --git a/src/App.tsx b/src/App.tsx
index 687d6c8..47e3bfc 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -157,16 +157,18 @@ export function App() {
 
   if (mindSpacePreview) {
     return (
-      <MindSpaceView
-        previewMode
-        user={PREVIEW_USER}
-        onBack={() => {
-          window.location.href = '/';
-        }}
-        onLogout={() => {
-          window.location.href = '/';
-        }}
-      />
+      <ChatProvider user={PREVIEW_USER}>
+        <MindSpaceView
+          previewMode
+          user={PREVIEW_USER}
+          onBack={() => {
+            window.location.href = '/';
+          }}
+          onLogout={() => {
+            window.location.href = '/';
+          }}
+        />
+      </ChatProvider>
     );
   }
 
diff --git a/src/components/BalanceRing.tsx b/src/components/BalanceRing.tsx
index fb153f7..7a1d4b6 100644
--- a/src/components/BalanceRing.tsx
+++ b/src/components/BalanceRing.tsx
@@ -1,12 +1,11 @@
 import { useEffect, useRef, useState, type CSSProperties } from 'react';
-import { getMyBillingLedger, getMyUsage } from '../api/client';
-import type { LedgerEntry, UsageRecord } from '../types';
+import { getMyUsage } from '../api/client';
+import type { UsageRecord } from '../types';
 
 const RING_R = 16;
 const CIRC = 2 * Math.PI * RING_R;
 const POPOVER_WIDTH = 260;
 const RECENT_USAGE_LIMIT = 5;
-const RECENT_LEDGER_LIMIT = 8;
 
 function formatYuan(cents: number) {
   return `¥${(cents / 100).toFixed(2)}`;
@@ -49,16 +48,6 @@ function formatUsageTime(ts: number) {
   });
 }
 
-function formatLedgerLabel(entry: LedgerEntry) {
-  if (entry.note === '新用户赠送') return '新用户赠送';
-  if (entry.note?.startsWith('order:')) return '微信支付充值';
-  if (entry.note === '用户自助充值') return '微信支付充值';
-  if (entry.note === '管理员充值') return '管理员充值';
-  if (entry.type === 'refund') return '退款';
-  if (entry.type === 'adjust') return entry.note?.trim() || '账户调整';
-  return entry.note?.trim() || '账户充值';
-}
-
 type BalanceRingProps = {
   balanceCents: number;
   totalCreditCents?: number;
@@ -77,9 +66,6 @@ export function BalanceRing({
   const [usageRecords, setUsageRecords] = useState<UsageRecord[] | null>(null);
   const [usageLoading, setUsageLoading] = useState(false);
   const [usageError, setUsageError] = useState<string | null>(null);
-  const [ledgerEntries, setLedgerEntries] = useState<LedgerEntry[] | null>(null);
-  const [ledgerLoading, setLedgerLoading] = useState(false);
-  const [ledgerError, setLedgerError] = useState<string | null>(null);
   const wrapRef = useRef<HTMLDivElement>(null);
 
   const total = Math.max(totalCreditCents ?? balanceCents, balanceCents, 0);
@@ -137,8 +123,6 @@ export function BalanceRing({
     let cancelled = false;
     setUsageLoading(true);
     setUsageError(null);
-    setLedgerLoading(true);
-    setLedgerError(null);
     void getMyUsage()
       .then((records) => {
         if (!cancelled) setUsageRecords(records);
@@ -151,18 +135,6 @@ export function BalanceRing({
       .finally(() => {
         if (!cancelled) setUsageLoading(false);
       });
-    void getMyBillingLedger(RECENT_LEDGER_LIMIT)
-      .then((entries) => {
-        if (!cancelled) setLedgerEntries(entries);
-      })
-      .catch((err) => {
-        if (!cancelled) {
-          setLedgerError(err instanceof Error ? err.message : '加载失败');
-        }
-      })
-      .finally(() => {
-        if (!cancelled) setLedgerLoading(false);
-      });
     return () => {
       cancelled = true;
     };
@@ -173,13 +145,9 @@ export function BalanceRing({
     setUsageRecords(null);
     setUsageError(null);
     setUsageLoading(false);
-    setLedgerEntries(null);
-    setLedgerError(null);
-    setLedgerLoading(false);
   }, [open]);
 
   const recentUsage = (usageRecords ?? []).slice(0, RECENT_USAGE_LIMIT);
-  const recentLedger = (ledgerEntries ?? []).slice(0, RECENT_LEDGER_LIMIT);
   const centerLabel = total <= 0 ? '—' : empty ? '0%' : `${pct}%`;
   const ariaLabel = total > 0 ? `账户额度，剩余 ${pct}%` : '账户额度';
 
@@ -251,29 +219,6 @@ export function BalanceRing({
           <p className="balance-popover-hint">按人民币结算，每次对话按实际用量扣费</p>
         </div>
 
-        <div className="balance-popover-section">
-          <h5>充值明细</h5>
-          {ledgerLoading ? (
-            <p className="balance-popover-muted">加载中…</p>
-          ) : ledgerError ? (
-            <p className="balance-popover-muted">{ledgerError}</p>
-          ) : recentLedger.length === 0 ? (
-            <p className="balance-popover-muted">暂无充值记录</p>
-          ) : (
-            <ul className="balance-usage-list">
-              {recentLedger.map((row) => (
-                <li key={row.id} className="balance-usage-item">
-                  <span className="balance-usage-time">{formatUsageTime(row.createdAt)}</span>
-                  <span className="balance-usage-tokens">{formatLedgerLabel(row)}</span>
-                  <strong className="balance-usage-credit">
-                    +{formatYuan(Math.abs(row.amountCents))}
-                  </strong>
-                </li>
-              ))}
-            </ul>
-          )}
-        </div>
-
         <div
           className={`balance-popover-section balance-popover-usage${showRecentUsage ? ' expanded' : ''}`}
         >