Change 'today report' to 'yesterday report' for next-day reporting

src/gui.py

@@ -5,7 +5,7 @@
 import tkinter as tk
 from tkinter import ttk, messagebox, scrolledtext
 import threading
-from datetime import datetime
+from datetime import datetime, timedelta
 import sys
 import os
 
@@ -86,7 +86,7 @@ class OrbitInGUI:
         
         btn_report_today = ttk.Button(
             left_frame,
-            text="今日日报",
+            text="昨日日报",
             command=self.generate_today_report,
             width=20
         )
@@ -372,9 +372,9 @@ class OrbitInGUI:
             self.set_status("错误")
     
     def generate_today_report(self):
-        """生成今日日报"""
-        today = datetime.now().strftime('%Y-%m-%d')
-        self.date_var.set(today)
+        """生成昨日日报（因为是第二天汇报）"""
+        yesterday = (datetime.now() - timedelta(days=1)).strftime('%Y-%m-%d')
+        self.date_var.set(yesterday)
         self.generate_report()
     
     def add_unaccounted(self):