feat(portal-shell): 学生域全页面迁移与规范合规修复

- 学生域 32 页全量迁移(含作答/自动保存/提交/诊断)

- 补齐 4 个 MSW mock 缺口,修 diagnostic case 名

- 修 4 处 Tailwind 任意值;新增共享组件与路由

services/data-ana/src/graphql/generated/schema.graphql

@@ -176,6 +176,67 @@ type StudentDashboard {
   weak_points: WeakPoint
   recent_trends: TrendPoint
   pending_homework: Int
+  # @contract-pending P3 student dashboard extension fields.
+  # Not yet in analytics.proto; MSW mock returns these at runtime.
+  # To be upstreamed into proto when the contract is finalized.
+  student_name: String
+  enrolled_classes_count: Int
+  graded_count: Int
+  due_soon_count: Int
+  overdue_count: Int
+  grades: StudentDashboardGrades
+  upcoming_assignments: [StudentDashboardUpcomingAssignment!]
+  today_schedule: [StudentDashboardTodayScheduleItem!]
+}
+
+type StudentDashboardGrades {
+  ranking: StudentDashboardRanking
+  trend: [StudentDashboardTrendItem!]
+  recent: [StudentDashboardRecentItem!]
+}
+
+type StudentDashboardRanking {
+  rank: Int
+  class_size: Int
+  percentage: Float
+}
+
+type StudentDashboardTrendItem {
+  assignment_id: String
+  assignment_title: String
+  score: Float
+  max_score: Float
+  percentage: Float
+  class_avg: Float
+  submitted_at: String
+}
+
+type StudentDashboardRecentItem {
+  assignment_id: String
+  assignment_title: String
+  score: Float
+  max_score: Float
+  percentage: Float
+  submitted_at: String
+}
+
+type StudentDashboardUpcomingAssignment {
+  id: String
+  title: String
+  subject_name: String
+  due_at: String
+  progress_status: String
+  latest_score: Float
+}
+
+type StudentDashboardTodayScheduleItem {
+  id: String
+  class_id: String
+  class_name: String
+  course: String
+  start_time: String
+  end_time: String
+  location: String
 }
 
 type ParentDashboard {