feat: 新增首页组件，展示账户概览、近期交易、支出趋势和预算统计。

src/pages/Home/Home.tsx

@@ -482,8 +482,7 @@ function Home() {
               {streakInfo && streakInfo.currentStreak > 0 && (
                 <div
                   className="streak-badge"
-                  onClick={() => setShowContributionModal(true)}
-                  title={`最长连续: ${streakInfo.longestStreak} 天\n累计记账: ${streakInfo.totalRecordDays} 天\n点击查看详情`}
+                  title={`最长连续: ${streakInfo.longestStreak} 天\n累计记账: ${streakInfo.totalRecordDays} 天`}
                 >
                   <Icon icon="solar:heart-bold" width="16" className="streak-icon" />
                   <span className="streak-count">{streakInfo.currentStreak}</span>
@@ -531,6 +530,11 @@ function Home() {
           />
         </div>
 
+        {/* Contribution Heatmap */}
+        <div>
+          <ContributionHeatmap streakInfo={streakInfo} />
+        </div>
+
         {/* Asset Dashboard - Requirement 8.1 */}
         <section className="dashboard-grid">
           {/* Net Worth Card - Main Hero */}
@@ -724,13 +728,6 @@ function Home() {
         todaySpend={todaySpend}
         yesterdaySpend={yesterdaySpend}
       />
-
-      {/* Contribution Heatmap Modal */}
-      <ContributionModal
-        isOpen={showContributionModal}
-        onClose={() => setShowContributionModal(false)}
-        streakInfo={streakInfo}
-      />
     </div>
   );
 }