Implement Phase 19 updates and user/editor verification

- Updated architectural specifications for Phase 19 scenery, backgrounds, and surface finishes to reflect implementation status and user verification results.
- Revised UI/UX specifications for background ground and wall color, plain background, and starter scene composition to indicate successful implementation and verification.
- Enhanced scenery controller and sandbox stage scripts to improve eraser functionality and user interactions.
- Adjusted test cases to align with the latest changes in scenery and background implementations, ensuring all checks pass successfully.
- Added new buttons for wall area erasure in the scenery capture bar and updated layout handling for better user experience.
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2026-10-22 17:02:39 -04:00
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# Phase 19 — Scenery, backgrounds, and surface finishes: UI/UX specification
> **Status:** The original Phase 19 UI/UX is approved and implemented, including the Stage-relative asset-sizing addition (2026-10-16). The accepted camera-aware Sky behavior is being specified as a focused Phase 19 addition. Based on the [accepted product brief](../plans/phase_19_scenery_backgrounds_surface_finishes.md). Full Phase 19 user/editor verification remains pending.
> **Status (2026-10-22):** Phase 19 UI/UX is implemented and user/editor verified. The user completed the integrated visual and interaction checks; the scenery suite passes **706 checks with 0 failures**. Camera-aware Sky and Plain Background are later Phase 19 additions; see the [Plain Background plan](../plans/phase_19_plain_background.md) and [UI/UX specification](phase_19_plain_background_ui_ux.md). Based on the [Phase 19 product plan](../plans/phase_19_scenery_backgrounds_surface_finishes.md).
>
> **Decision:** Use a responsive Scenery chooser followed by canvas tools. Placement stays active for repeated copies. Right-click exits placement. Scenery artwork keeps live `.prop` references, with a visible, repairable placeholder if a referenced file cannot be found. The Phase 19 addition standardizes new artwork around a standing-stickman size guide and adds single-placement Scenery resizing; direct single-piece transforms commit on release, while the existing group preview keeps its Keep/Cancel boundary. Phase 19 does not add Undo; Stage Undo is deferred to its own future phase and should be recorded in tech debt during architecture planning.