feat(homework,classes,course-plans): add scans, student data, take confirm, error boundaries, dialogs, hooks, calendar

homework:

- Add data-access-scans, data-access-student, data-access-utils, data-access-exam-cross

- Add excellent-submissions, homework-take-confirm-dialog, homework-take-sidebar components

classes:

- Add class-delete-dialog, class-error-boundary, class-form-dialog, class-form-utils

- Add class-list-table, class-list-toolbar, class-skeleton

- Add schedule-create-dialog, schedule-delete-dialog, schedule-edit-dialog, schedule-utils

- Add data-access-teacher and hooks directory

course-plans:

- Add course-plan-calendar, sortable-week-row, template-picker-dialog components

- Add lib directory

src/modules/classes/components/class-list-toolbar.tsx

@@ -0,0 +1,32 @@
+"use client"
+
+import { Plus } from "lucide-react"
+import { useTranslations } from "next-intl"
+
+import { Badge } from "@/shared/components/ui/badge"
+import { Button } from "@/shared/components/ui/button"
+
+export function ClassListToolbar({
+  count,
+  onNew,
+  isWorking,
+  disabled = false,
+}: {
+  count: number
+  onNew: () => void
+  isWorking: boolean
+  disabled?: boolean
+}) {
+  const t = useTranslations("classes")
+  return (
+    <div className="flex items-center justify-between">
+      <Badge variant="secondary" className="tabular-nums">
+        {count}
+      </Badge>
+      <Button onClick={onNew} disabled={isWorking || disabled}>
+        <Plus className="mr-2 h-4 w-4" />
+        {t("list.new")}
+      </Button>
+    </div>
+  )
+}