chore: remove dead code and tune frontend chunks

Remove unused production symbols, starter assets, and stale browser tooling; reduce frontend chunk fragmentation.

apps/admin/src/pages/Classrooms/classroom-fields.integration.test.ts

@@ -1,16 +0,0 @@
-import { describe, expect, it } from 'vitest';
-import { CLASSROOM_VISIBLE_FIELDS } from './classroom-fields';
-
-describe('classroom visible fields', () => {
-  it('excludes obsolete course and supervisor metadata', () => {
-    expect(CLASSROOM_VISIBLE_FIELDS).toEqual([
-      'name',
-      'building',
-      'floor',
-      'roomType',
-      'capacity',
-      'status',
-      'notes',
-    ]);
-  });
-});

apps/admin/src/pages/Classrooms/classroom-fields.ts

@@ -1,9 +0,0 @@
-export const CLASSROOM_VISIBLE_FIELDS = [
-  'name',
-  'building',
-  'floor',
-  'roomType',
-  'capacity',
-  'status',
-  'notes',
-] as const;