feat(lesson-preparation): major update with AI features, schedules, and new components

- Add actions-schedules.ts and data-access-schedules.ts for schedule management

- Add AI differentiation, AI feedback, consistency check dialogs

- Add attachment-picker, curriculum-heatmap, print-view, version-diff-view

- Add lesson-plan-mobile-view and schedule-dialog components

- Add lib: ai-differentiation, ai-feedback, auto-layout, consistency-check,

  curriculum-coverage, export, version-diff

- Add history-slice hook for version history

- Update existing components, hooks, providers, services, types

- Add teacher lesson-plans heatmap and library pages

src/modules/lesson-preparation/components/blocks/exercise-block.tsx

@@ -170,6 +170,7 @@ export function ExerciseBlock({ blockId, data, classes, textbookId, chapterId }:
             planId={planId}
             blockId={blockId}
             classes={classes}
+            items={data.items}
             onClose={() => setShowPublish(false)}
             onPublished={() => router.refresh()}
           />