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/modules/student/components/student-schedule-view.tsx

@@ -2,6 +2,7 @@ import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { CalendarX } from "lucide-react"
 import { ScheduleList } from "@/shared/components/schedule/schedule-list"
+import { cn } from "@/shared/lib/utils"
 
 import type { StudentScheduleItem } from "@/modules/classes/types"
 
@@ -15,6 +16,16 @@ const WEEKDAYS: Array<{ key: 1 | 2 | 3 | 4 | 5 | 6 | 7; label: string }> = [
   { key: 7, label: "Sun" },
 ]
 
+const getTodayWeekday = (): 1 | 2 | 3 | 4 | 5 | 6 | 7 => {
+  // getDay() returns 0 (Sun) - 6 (Sat); convert to 1 (Mon) - 7 (Sun)
+  const WEEKDAY_MAP = [7, 1, 2, 3, 4, 5, 6] as const
+  const day = new Date().getDay()
+  if (day < 0 || day > 6) {
+    throw new Error(`Invalid day from getDay(): ${day}`)
+  }
+  return WEEKDAY_MAP[day]
+}
+
 export function StudentScheduleView({ items }: { items: StudentScheduleItem[] }) {
   if (items.length === 0) {
     return (
@@ -27,6 +38,8 @@ export function StudentScheduleView({ items }: { items: StudentScheduleItem[] })
     )
   }
 
+  const todayKey = getTodayWeekday()
+
   const itemsByDay = new Map<number, StudentScheduleItem[]>()
   for (const item of items) {
     const list = itemsByDay.get(item.weekday) ?? []
@@ -41,17 +54,33 @@ export function StudentScheduleView({ items }: { items: StudentScheduleItem[] })
     <div className="grid gap-4 lg:grid-cols-2">
       {WEEKDAYS.map((d) => {
         const dayItems = itemsByDay.get(d.key) ?? []
+        const isToday = d.key === todayKey
         return (
-          <Card key={d.key}>
+          <Card
+            key={d.key}
+            className={cn(
+              isToday && "border-primary ring-1 ring-primary/30 shadow-sm"
+            )}
+          >
             <CardHeader className="pb-3">
-              <CardTitle className="text-sm font-medium">{d.label}</CardTitle>
+              <CardTitle className="flex items-center gap-2 text-sm font-medium">
+                <span>{d.label}</span>
+                {isToday && (
+                  <span className="rounded-full bg-primary px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-primary-foreground">
+                    Today
+                  </span>
+                )}
+              </CardTitle>
             </CardHeader>
             <CardContent>
               {dayItems.length === 0 ? (
                 <div className="text-sm text-muted-foreground">No classes.</div>
               ) : (
                 <ScheduleList
-                  items={dayItems}
+                  items={dayItems.map((item) => ({
+                    ...item,
+                    href: `/student/learning/courses/${encodeURIComponent(item.classId)}`,
+                  }))}
                   variant="card"
                   spacingClassName="space-y-3"
                 />