forked from 1b-agent/opencadstudio-upstream
Milestone 1: enable Parameters > Visibility and add interactive BPARAMETER VISIBILITY placement using the existing native visibility parameter, grip and state engine. Bare BPARAMETER currently offers only Visibility; other parameter, action and set entries remain unavailable. Show the placed parameter in the editor and support cancel, local undo/ redo, save/discard and saved-edit undo. Bind placement to its document and definition, reject duplicates and invalid points, and protect existing authoring graphs from replacement. Keep visibility parameters and their grips aligned with geometry when a BEDIT UCS change reframes the definition, including parameter-only blocks. Validation: 9 targeted tests, 272 block checks and 58 dock checks passed (overlapping groups). All 17 local DWG fixtures passed in-memory DWG/DXF placement roundtrips and graph-preservation checks; originals unchanged.