feat(日历): 添加交易热力图组件展示每日交易统计

- 新增 ContributionHeatmap 组件实现类似 GitHub 贡献热力图的可视化
- 添加 getDailyStatisticsRange API 接口获取日期范围内的每日统计数据
- 调整日历页面布局以容纳热力图组件
- 热力图支持动态阈值计算和暗黑模式适配
- 交易变更时自动刷新热力图数据

Repository/TransactionRecordRepository.cs

@@ -60,6 +60,14 @@ public interface ITransactionRecordRepository : IBaseRepository<TransactionRecor
     /// <returns>每天的消费笔数和金额</returns>
     Task<Dictionary<string, (int count, decimal amount)>> GetDailyStatisticsAsync(int year, int month);
 
+    /// <summary>
+    /// 获取指定日期范围内的每日统计
+    /// </summary>
+    /// <param name="startDate">开始日期</param>
+    /// <param name="endDate">结束日期</param>
+    /// <returns>每天的消费笔数和金额</returns>
+    Task<Dictionary<string, (int count, decimal amount)>> GetDailyStatisticsByRangeAsync(DateTime startDate, DateTime endDate);
+
     /// <summary>
     /// 获取指定日期范围内的交易记录
     /// </summary>
@@ -342,6 +350,11 @@ public class TransactionRecordRepository(IFreeSql freeSql) : BaseRepository<Tran
         var startDate = new DateTime(year, month, 1);
         var endDate = startDate.AddMonths(1);
 
+        return await GetDailyStatisticsByRangeAsync(startDate, endDate);
+    }
+
+    public async Task<Dictionary<string, (int count, decimal amount)>> GetDailyStatisticsByRangeAsync(DateTime startDate, DateTime endDate)
+    {
         var records = await FreeSql.Select<TransactionRecord>()
             .Where(t => t.OccurredAt >= startDate && t.OccurredAt < endDate)
             .ToListAsync();