feat(student): 完成 student 模块 v4 剩余修复

- P1-4.2: 新增班级详情页 courses/[classId]，展示教师/学校/教室信息与课表

- P2-2.5: 今日课表卡片高亮当前/下一节课（useMemo 实时计算）

- P2-3.9: 作业作答进度网格支持点击跳转题目（scrollIntoView）

- P2-3.10: 作业复习视图显示正确答案（选择/判断/文本题）

- P2-4.4: 课程列表支持按班级名/教师/学校搜索

- P2-5.2: 成绩页新增趋势折线图组件 GradeTrendCard

- P2-9.2/9.3: 诊断报告新增历史记录卡片与弱点练习入口

- P2-10.2: 选课列表支持搜索与选课模式筛选

- P2-11.3: 修复教材阅读页全屏溢出

- P3-1.5: 面包屑保留首个角色段作为根上下文

- P3-7.3: 课表项支持点击跳转至班级详情页（ScheduleList href）

src/shared/components/schedule/schedule-list.tsx

@@ -1,6 +1,7 @@
 "use client"
 
 import type { ReactNode } from "react"
+import Link from "next/link"
 import { Clock, MapPin } from "lucide-react"
 
 import { Badge } from "@/shared/components/ui/badge"
@@ -23,6 +24,8 @@ export interface ScheduleListItemData {
   endTime: string
   location?: string | null
   className?: string
+  /** Optional href to navigate to when the item is clicked */
+  href?: string
 }
 
 interface ScheduleListItemProps {
@@ -46,8 +49,8 @@ export function ScheduleListItem({
       ? "flex items-center justify-between border-b pb-4 last:border-0 last:pb-0"
       : "flex items-start justify-between gap-3 rounded-md border bg-card p-3"
 
-  return (
-    <div key={item.id} className={cn(wrapperClass, className)}>
+  const content = (
+    <>
       <div className="space-y-1 min-w-0">
         <div className="font-medium leading-none truncate">{item.course}</div>
         <div className="flex flex-wrap items-center gap-x-3 gap-y-1 text-sm text-muted-foreground">
@@ -72,6 +75,23 @@ export function ScheduleListItem({
           {item.className}
         </Badge>
       ) : null}
+    </>
+  )
+
+  if (item.href) {
+    return (
+      <Link
+        href={item.href}
+        className={cn(wrapperClass, className, "transition-colors hover:bg-muted/40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring")}
+      >
+        {content}
+      </Link>
+    )
+  }
+
+  return (
+    <div className={cn(wrapperClass, className)}>
+      {content}
     </div>
   )
 }