feat: 创建首页并实现现代化的 Bento Grid 布局，展示财务概览数据和快速操作。

src/pages/Home/Home.tsx

@@ -194,6 +194,8 @@ function Home() {
     };
   }, [todayTransactions, weekTransactions, categories, monthlyBudgetSpentTotal]);
 
+  const weeklyTotal = useMemo(() => calculateTotalExpense(weekTransactions), [weekTransactions]);
+
   const recentTransactionsForAI = useMemo(() => {
     return weekTransactions.map(t => ({
       date: new Date(t.transactionDate).toLocaleDateString('zh-CN'),
@@ -320,7 +322,7 @@ function Home() {
             top3Categories={top3Categories}
             todayTransactionCount={todayTransactionCount}
             last7DaysSpend={last7DaysSpend}
-            weeklyTotal={useMemo(() => calculateTotalExpense(weekTransactions), [weekTransactions])}
+            weeklyTotal={weeklyTotal}
           />
         </div>
         <div className="bento-span-1" onClick={() => setShowHealthModal(true)} style={{ cursor: 'pointer' }}>