Bone Flow Editor v1.0.43 / Realtime Preview #001 Build 1.0.11

- Previous v1.0.42 still showed the old fixed-height initial preview because initial automatic FIT kept fitHeightActive=false.
- Build 1.0.11 enables height compaction from the first automatic FIT.
- Horizontal Preview-only flow is verified to compact below the previous 420px sample height.
- Explicit FIT uses the same runtime path.
- Runtime renderer/Shape/Joint source payload remains unchanged.
