Apply lesson cover as poster for embedded kinescopeVideo nodes

graphify-out/cache/ast/6bae9abdfd8c738914ff706a2d17e24f5a9e592c0eeae14e0e27e5e780fa776f.json

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+{"nodes": [{"id": "users_dementiy_documents_claude_lms_system_entrypoint_sh", "label": "entrypoint.sh", "file_type": "code", "source_file": "/Users/dementiy/Documents/Claude/lms-system/entrypoint.sh", "source_location": "L1"}], "edges": []}