HandoverServiceTest: 30 new cases covering:
- assign(): happy path, draft→in_progress transition, permission check,
zero assignedTo, not found, email sent, due date passed to repo
- submitForReview(): assignee and manager paths, non-assignee denied,
wrong status (under_review/completed), revision created, email sent
- resendNotification(): happy path, permission denied, no assignee
- statusLabel/Variant for under_review
HandoverNotificationServiceTest: 9 new cases covering:
- notifyAssigned: sends correct template+vars, skips on empty/null email,
fallback dash for empty debitor and due_date
- notifyReviewRequested: sends to manager, skips on no email,
fallback dash for empty assignee name
48 tests total, all passing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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