feat: 新增首页，提供账户概览、交易趋势、快速记账、AI记账和贡献图等功能。

src/pages/Home/Home.css

@@ -323,6 +323,16 @@
   border: 1px solid rgba(255, 255, 255, 0.2);
 }
 
+/* 金额单位后缀样式 (万/亿) */
+.card-value-suffix {
+  font-size: 1.5rem;
+  font-weight: 600;
+  margin-left: 4px;
+  opacity: 0.9;
+  align-self: flex-end;
+  padding-bottom: 4px;
+}
+
 /* Secondary Cards */
 .assets-card,
 .liabilities-card {

src/pages/Home/Home.tsx

@@ -166,13 +166,47 @@ function Home() {
   const totalLiabilities = calculateTotalLiabilities(accounts);
   const netWorth = totalAssets - totalLiabilities;
 
+  // 标准金额格式化（带完整小数）
   const formatCurrency = (amount: number): string => {
     return new Intl.NumberFormat('zh-CN', {
       style: 'currency',
       currency: 'CNY',
+      minimumFractionDigits: 0,
+      maximumFractionDigits: amount % 1 === 0 ? 0 : 2, // 整数不显示小数
     }).format(amount);
   };
 
+  // 大数字简洁显示（用于净资产等主要展示）
+  const formatLargeNumber = (amount: number): { value: string; suffix: string } => {
+    const absAmount = Math.abs(amount);
+    const sign = amount < 0 ? '-' : '';
+
+    if (absAmount >= 100000000) {
+      // 亿
+      const value = absAmount / 100000000;
+      return {
+        value: sign + value.toLocaleString('zh-CN', { maximumFractionDigits: 2 }),
+        suffix: '亿'
+      };
+    } else if (absAmount >= 10000) {
+      // 万
+      const value = absAmount / 10000;
+      return {
+        value: sign + value.toLocaleString('zh-CN', { maximumFractionDigits: 2 }),
+        suffix: '万'
+      };
+    } else {
+      // 直接显示
+      return {
+        value: sign + absAmount.toLocaleString('zh-CN', {
+          minimumFractionDigits: 0,
+          maximumFractionDigits: absAmount % 1 === 0 ? 0 : 2
+        }),
+        suffix: ''
+      };
+    }
+  };
+
   // Lock body scroll when modal is open
   useEffect(() => {
     if (showAccountForm) {
@@ -367,9 +401,14 @@ function Home() {
           <div className="dashboard-card home-net-worth-card">
             <div className="card-content">
               <span className="card-label">净资产</span>
-              <div className="card-value-group">
+              <div className="card-value-group" title={`¥${netWorth.toLocaleString('zh-CN', { minimumFractionDigits: 2 })}`}>
                 <span className="currency-symbol">¥</span>
-                <span className="card-value-main privacy-mask">{formatCurrency(netWorth).replace(/[^0-9.,-]/g, '')}</span>
+                <span className="card-value-main privacy-mask">
+                  {formatLargeNumber(netWorth).value}
+                </span>
+                {formatLargeNumber(netWorth).suffix && (
+                  <span className="card-value-suffix">{formatLargeNumber(netWorth).suffix}</span>
+                )}
               </div>
               <div className="card-footer">
                 <span className="trend-neutral">总览所有账户</span>