fix(scripts): import classroom functions directly to fix build

The barrel export from @/lib/classroom pulls in all manager modules,
some of which have transitive dependencies on React components with
styled-system imports. Import directly from the specific manager files
(classroom-manager.ts and enrollment-manager.ts) to avoid the
dependency chain that breaks esbuild bundling for the seed script.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/scripts/seedTestStudents.ts

@@ -127,11 +127,9 @@ import {
 } from '../src/utils/problemGenerator'
 import { createEmptySkillSet, type SkillSet } from '../src/types/tutorial'
 import type { GameResultsReport } from '../src/lib/arcade/game-sdk/types'
-import {
-  createClassroom,
-  getTeacherClassroom,
-  directEnrollStudent,
-} from '../src/lib/classroom'
+// Import directly from specific manager files to avoid pulling in React components via barrel export
+import { createClassroom, getTeacherClassroom } from '../src/lib/classroom/classroom-manager'
+import { directEnrollStudent } from '../src/lib/classroom/enrollment-manager'
 
 // =============================================================================
 // BKT Simulation Utilities