Webviews & Undo Hardening

August saw two phases. The first half was a rapid stabilisation sprint — undo coverage was extended to wrap/break/paste operations, texture atlas loading was improved, and multi-select pivot reset shipped. Then on August 17 came the biggest architectural change yet — the entire renderer was migrated to Electron webviews (v1.1.0). This unlocked proper process isolation and paved the way for the multi-scene tab experience. The rest of August hardened the new architecture: text JSON styling, Spine skin support, the welcome screen showing recently opened scenes with thumbnails, fixed library search, and improved texture atlas frame handling. On the runtime side, August also saw the launch of the first two companion importer packages: zImporter_PIXI7 and zImporter_Phaser — npm libraries developers can drop into their own games to load and display zStudio scenes at runtime.