合并页面恢复钱包刷新

将可见性与焦点事件合并到同一零延迟刷新任务，避免前台切换产生连续请求。

卸载时清理待执行定时器，并补充双事件回归测试。

src/components/platform-entry/PlatformEntryActiveFlowShell.test.tsx

@@ -267,7 +267,7 @@ describe('PlatformEntryActiveFlowShell', () => {
     await screen.findByLabelText('泥点 67');
   });
 
-  it('refreshes the shared wallet when the authenticated page regains focus', async () => {
+  it('coalesces visibility and focus refreshes when the page returns to the foreground', async () => {
     authUiMock.value.user = {
       id: 'user-1',
       publicUserCode: '100001',
@@ -300,6 +300,7 @@ describe('PlatformEntryActiveFlowShell', () => {
     await screen.findByLabelText('泥点 10');
 
     await act(async () => {
+      document.dispatchEvent(new Event('visibilitychange'));
       window.dispatchEvent(new Event('focus'));
     });
 

src/stores/usePlatformWalletStore.ts

@@ -28,20 +28,30 @@ export function usePlatformWalletLifecycle(
     }
 
     void onWalletBalanceMayHaveChanged();
-    const refreshWallet = () => {
-      void onWalletBalanceMayHaveChanged();
+    let foregroundRefreshTimer: number | null = null;
+    const scheduleWalletRefresh = () => {
+      if (foregroundRefreshTimer !== null) {
+        return;
+      }
+      foregroundRefreshTimer = window.setTimeout(() => {
+        foregroundRefreshTimer = null;
+        void onWalletBalanceMayHaveChanged();
+      }, 0);
     };
     const refreshVisibleWallet = () => {
       if (document.visibilityState === 'visible') {
-        refreshWallet();
+        scheduleWalletRefresh();
       }
     };
 
-    window.addEventListener('focus', refreshWallet);
+    window.addEventListener('focus', scheduleWalletRefresh);
     document.addEventListener('visibilitychange', refreshVisibleWallet);
     return () => {
-      window.removeEventListener('focus', refreshWallet);
+      window.removeEventListener('focus', scheduleWalletRefresh);
       document.removeEventListener('visibilitychange', refreshVisibleWallet);
+      if (foregroundRefreshTimer !== null) {
+        window.clearTimeout(foregroundRefreshTimer);
+      }
     };
   }, [
     canAccessProtectedData,