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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# Phase 19 — Plain Background: architecture specification
> **Status:** Approved design; implementation under way. This specification implements the [accepted product brief](../plans/phase_19_plain_background.md) and [UI/UX specification](phase_19_plain_background_ui_ux.md). The color-choices and custom-picker PNGs reflect the current-color chip as the sole custom-picker entry and the simple **Preview** label; the solid fill and exact labels in the UI/UX specification govern implementation.
> **Status (2026-10-22):** Implemented and user/editor verified. The user explicitly verified Plain Background save/reopen; the Phase 19 scenery suite passes 706 checks with 0 failures. This specification implements the [Plain Background brief](../plans/phase_19_plain_background.md) and [UI/UX specification](phase_19_plain_background_ui_ux.md). The color-choices and custom-picker PNGs reflect the current-color chip as the sole custom-picker entry and the simple **Preview** label; the solid fill and exact labels in the UI/UX specification govern implementation.
## Scope and decisions