feat(统计): 提交记录和流程图的统计弹框记住上次查的班级、题号、时间段，一小时内再打开自动带上

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/utils/constants.ts

@@ -156,6 +156,8 @@ export const STORAGE_KEY = {
   ADMIN_SIDER_COLLAPSED: "adminSiderCollapsed",
   DEMO_MODE: "demoMode",
   LOGIN_CLASS: "loginClass",
+  STATISTICS_QUERY: "statisticsQuery",
+  FLOWCHART_STATISTICS_QUERY: "flowchartStatisticsQuery",
 }
 
 export const DIFFICULTY = {