add school year model

src/pages/teacher/TeacherCorePages.tsx

@@ -1,10 +1,11 @@
 import { useEffect, useState } from 'react'
-import { Link, useParams } from 'react-router-dom'
+import { Link, useParams, useSearchParams } from 'react-router-dom'
 import {
   fetchTeacherDashboard,
   isTeacherDashboardApiEnabled,
   type TeacherDashboardPayload,
 } from '../../api/teacherSession'
+import { useSchoolYearOptions } from '../../hooks/useSchoolYearOptions'
 import { TeacherShell } from './TeacherShell'
 import { useTeacherResource } from './useTeacherResource'
 
@@ -18,6 +19,16 @@ type SentPayload = { sentMessages?: MsgRow[] }
 
 type TeacherMessagePayload = { message?: Record<string, unknown>; thread?: unknown[] }
 
+function appendSchoolYearParam(path: string, schoolYear: string): string {
+  if (!schoolYear) return path
+  const [base, hash = ''] = path.split('#', 2)
+  const [pathname, query = ''] = base.split('?', 2)
+  const params = new URLSearchParams(query)
+  if (!params.get('school_year')) params.set('school_year', schoolYear)
+  const next = `${pathname}?${params.toString()}`
+  return hash ? `${next}#${hash}` : next
+}
+
 /** Every `/app/teacher/*` route so nothing is hidden behind the slim top nav alone. */
 const TEACHER_PAGE_GROUPS = [
   {
@@ -204,14 +215,20 @@ export function TeacherNoClassesPage() {
 
 /** `teacher/select_semester.php` */
 export function TeacherSelectSemesterPage() {
+  const [searchParams] = useSearchParams()
   const { data, loading, error } = useTeacherResource<{
     invalidChoice?: string
     fallPath?: string
     springPath?: string
   }>('/select-semester')
+  const requestedSchoolYear = searchParams.get('school_year')?.trim() ?? ''
+  const { selectedYear } = useSchoolYearOptions({
+    preferredYear: requestedSchoolYear,
+  })
+  const activeSchoolYear = requestedSchoolYear || selectedYear
 
-  const fallTo = data?.fallPath ?? '/app/teacher/scores?semester=Fall'
-  const springTo = data?.springPath ?? '/app/teacher/scores?semester=Spring'
+  const fallTo = appendSchoolYearParam(data?.fallPath ?? '/app/teacher/scores?semester=Fall', activeSchoolYear)
+  const springTo = appendSchoolYearParam(data?.springPath ?? '/app/teacher/scores?semester=Spring', activeSchoolYear)
 
   return (
     <TeacherShell title="Choose a semester" loading={loading} error={error}>