feat(lesson-preparation): add AI evaluation, analytics, attachments, calendar, comments, review, substitutes, formative, and version diff

- Add actions-ai-evaluation, actions-analytics, actions-attachments, actions-calendar, actions-comments, actions-formative, actions-questions, actions-review, actions-substitutes

- Add corresponding data-access layers for each new action module

- Add calendar-view, curriculum-map-view, version-diff-viewer components

- Add editor-slice, selection-slice, version-slice hooks for state management

- Add document-diff and scope-check lib utilities

- Add default-question-service and external-questions-bridge services

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

@@ -38,7 +38,7 @@ export function SummaryBlock({ data, onUpdate }: Props) {
         {t("summary.hint")}
       </div>
       {data.summaryPoints.map((point, idx) => (
-        <div key={idx} className="flex items-start gap-2">
+        <div key={`summary-${idx}`} className="flex items-start gap-2">
           <span className="text-xs text-on-surface-variant mt-1">{idx + 1}.</span>
           <input
             type="text"