refactor: 引入 SWR 统一钱包余额查询与轮询逻辑

src/features/wallet/wallet-screen.tsx

@@ -66,11 +66,13 @@ export function WalletScreen() {
         setLogsLoading(true);
       }
       try {
-        const b = await getWalletBalance({ currency });
+        // 并行请求余额和日志，避免瀑布式串行等待
+        const [b, nextLogs] = await Promise.all([
+          getWalletBalance({ currency }),
+          loadLogs(1, false),
+        ]);
         if (cancelled) return;
         setBalance(b);
-        const nextLogs = await loadLogs(1, false);
-        if (cancelled) return;
         setLogs(nextLogs);
       } catch (e) {
         if (!cancelled) {
@@ -93,9 +95,12 @@ export function WalletScreen() {
     setError(null);
     setLogsLoading(true);
     try {
-      const b = await getWalletBalance({ currency });
+      // 并行请求余额和日志
+      const [b] = await Promise.all([
+        getWalletBalance({ currency }),
+        loadLogs(1, false),
+      ]);
       setBalance(b);
-      await loadLogs(1, false);
     } catch (e) {
       setError(formatWalletClientError(e, t));
     } finally {