html_export

The extension should support building documentation as html from the requirement graph.
Html export should render ideas, attributes, references, and navigable structure suitable for sharing.
Core export pipeline lives in `@reqlan/analytical` ( `exportHtml` / `AnalysisApi.exportHtml` ); the extension command palette and CLI ( `reqlan export` ) are thin hosts.
A command palette action ( and the Ideas Summary link ) should open export_webview with HTML selected and export requirements to html as a multi-file static site ( single-file mode remains optional via html_export_runtime_modes ).
HTML-specific form fields live under html_export_form within that general export webview.
html_export_form
html_export_multi_file
html_export_internal_links
html_export_search
html_export_list_views
html_export_idea_pages
html_export_file_pages
html_export_code_reference_pages
html_export_cluster_pages
html_export_graph_page
html_export_attributes_index
html_export_attribute_pages
html_export_printable_pages
html_export_runtime_modes
html_export_scrollable_lists
html_export_header_link
html_export_url_base

Interactive page: html_export