2d77249d60
Document Phase 17 (skin_dialog popup shell migration) and enumerate the 16 remaining dialogs that still bypass render_popup: sort, compare, overwrite, filter, tree, encoding, connection, layout, owner, panel_options, pattern, confirm, config, permission, chattr, progress Each is ~50-100 LOC of refactor work (replace inline Clear+Block with render_popup call). Same premium chrome (rounded borders, MC-matching drop shadow) as Phase 17.