feat(classes): optimize teacher dashboard ui and implement grade management

scripts/seed.ts

@@ -12,7 +12,8 @@ import {
   textbooks, chapters,
   schools,
   grades,
-  classes, classEnrollments, classSchedule
+  classes, classEnrollments, classSchedule,
+  subjects
 } from "../src/shared/db/schema";
 import { createId } from "@paralleldrive/cuid2";
 import { faker } from "@faker-js/faker";
@@ -43,7 +44,7 @@ async function seed() {
       "submission_answers", "exam_submissions", "exam_questions", "exams",
       "questions_to_knowledge_points", "questions", "knowledge_points",
       "chapters", "textbooks",
-      "grades", "schools",
+      "grades", "schools", "subjects",
       "users_to_roles", "roles", "users", "accounts", "sessions"
     ];
     for (const table of tables) {
@@ -133,6 +134,17 @@ async function seed() {
     { id: "school_demo_2", name: "Demo School No.2", code: "DEMO2" },
   ])
 
+  // --- Seeding Subjects ---
+  await db.insert(subjects).values([
+    { id: createId(), name: "Mathematics", code: "MATH", order: 1 },
+    { id: createId(), name: "Physics", code: "PHYS", order: 2 },
+    { id: createId(), name: "Chemistry", code: "CHEM", order: 3 },
+    { id: createId(), name: "English", code: "ENG", order: 4 },
+    { id: createId(), name: "History", code: "HIST", order: 5 },
+    { id: createId(), name: "Geography", code: "GEO", order: 6 },
+    { id: createId(), name: "Biology", code: "BIO", order: 7 },
+  ])
+
   await db.insert(grades).values([
     {
       id: grade10Id,