Enhance audience management features with new components and API integrations

- Added `AssignCoursesModal`, `AudienceMemberRow`, `AudienceTable`, and related components for improved audience management UI.
- Implemented audience invite actions including resend and revoke functionality.
- Updated audience API to support importing members and assigning courses.
- Refactored audience data handling to include status and invite management.
- Improved overall user experience with pagination and selection features in the audience table.

apps/dashboard/src/lib/features/course/utils/lesson-draft.ts

@@ -0,0 +1,37 @@
+import type { TLocale } from '@cio/db/types';
+
+interface LessonDraft {
+  content: string;
+  timestamp: number;
+}
+
+function draftKey(lessonId: string, locale: TLocale): string {
+  return `lesson-draft-${lessonId}-${locale}`;
+}
+
+export function saveDraft(lessonId: string, locale: TLocale, content: string) {
+  try {
+    const draft: LessonDraft = { content, timestamp: Date.now() };
+    localStorage.setItem(draftKey(lessonId, locale), JSON.stringify(draft));
+  } catch {
+    // localStorage may be full or unavailable
+  }
+}
+
+export function loadDraft(lessonId: string, locale: TLocale): LessonDraft | null {
+  try {
+    const raw = localStorage.getItem(draftKey(lessonId, locale));
+    if (!raw) return null;
+    return JSON.parse(raw) as LessonDraft;
+  } catch {
+    return null;
+  }
+}
+
+export function clearDraft(lessonId: string, locale: TLocale) {
+  try {
+    localStorage.removeItem(draftKey(lessonId, locale));
+  } catch {
+    // ignore
+  }
+}