feat(报告): 添加PDF报告预览功能

新增预览PDF报告功能，允许用户在生成正式PDF前查看HTML格式的预览，样式与PDF保持一致。该功能使用与PDF相同的模板渲染，方便用户确认报告内容无误后再生成正式文件。

core/urls.py

@@ -40,6 +40,7 @@ urlpatterns = [
     path('report/', views.generate_report, name='generate_report'),
     path('report/<str:date>/', views.view_report, name='view_report'),
     path('report/<str:date>/pdf/', views.generate_pdf_report, name='generate_pdf_report'),
+    path('report/<str:date>/preview/', views.preview_pdf_report, name='preview_pdf_report'),
     
     # 系统配置
     path('settings/', views.system_settings, name='system_settings'),

core/views.py

@@ -560,6 +560,38 @@ def generate_pdf_report(request, date):
         logger.error(f"生成PDF报告失败: {str(e)}")
         return HttpResponse(f"生成PDF报告失败: {str(e)}", status=500)
 
+# 预览PDF报告
+def preview_pdf_report(request, date):
+    """预览PDF报告（HTML格式，样式与PDF一致）"""
+    logger.info(f"用户预览PDF报告: {date}")
+    
+    try:
+        report_date = datetime.strptime(date, '%Y-%m-%d').date()
+        yesterday = report_date - timedelta(days=1)
+        
+        # 获取指定日期的记录
+        yesterday_reading = ReadingRecord.objects.filter(date=yesterday)
+        yesterday_insight = InsightRecord.objects.filter(date=yesterday)
+        today_plan = TodayPlan.objects.filter(date=report_date)
+        
+        # 获取家庭事项统计
+        family_task_stats = FamilyTask.objects.values('type').annotate(count=Count('id'))
+        
+        context = {
+            'today': report_date,
+            'yesterday': yesterday,
+            'yesterday_reading': yesterday_reading,
+            'yesterday_insight': yesterday_insight,
+            'today_plan': today_plan,
+            'family_task_stats': family_task_stats,
+        }
+        
+        # 渲染HTML模板（与PDF使用相同的模板）
+        return render(request, 'core/report_pdf.html', context)
+    except Exception as e:
+        logger.error(f"预览PDF报告失败: {str(e)}")
+        return HttpResponse(f"预览PDF报告失败: {str(e)}", status=500)
+
 # 系统配置
 def system_settings(request):
     """系统配置"""