feat(parent): add attention banner, export button, and grade detail

- Add parent-attention-banner for highlighting items needing attention

- Add parent-export-button for data export capability

- Add child-grade-detail component for detailed grade viewing

- Update existing child-card, child-detail-header, child-grade-summary, child-schedule-card

- Update parent-children-data-page and data-access

src/modules/parent/data-access.ts

@@ -1,7 +1,7 @@
 import "server-only"
 
 import { cache } from "react"
-import { and, asc, eq } from "drizzle-orm"
+import { and, asc, eq, inArray } from "drizzle-orm"
 
 import { db } from "@/shared/db"
 import { parentStudentRelations } from "@/shared/db/schema"
@@ -267,3 +267,19 @@ export const getChildNameList = cache(
     }))
   },
 )
+
+/**
+ * v4-P1-5: 批量查询多个学生的家长 userId 列表。
+ * 用于通知场景：报告/成绩发布时同步通知所有相关家长。
+ * 返回去重后的 parentId 数组。
+ */
+export const getParentIdsByStudentIds = cache(
+  async (studentIds: string[]): Promise<string[]> => {
+    if (studentIds.length === 0) return []
+    const rows = await db
+      .select({ parentId: parentStudentRelations.parentId })
+      .from(parentStudentRelations)
+      .where(inArray(parentStudentRelations.studentId, studentIds))
+    return Array.from(new Set(rows.map((r) => r.parentId)))
+  },
+)