PR_26179_CHARLIE_033-sprites-canvas-preview-sync

[ToolboxAid]

Summary

• Fix Sprite Creator center canvas/right preview sync by rendering both from page-session editor state.
• Add Playwright regression coverage for draw, erase, fill, clear, undo, redo, picker, zoom, and shape sync.
• Preserve no DB/API/schema/persistence scope.

Validation

• PASS: node --check assets/toolbox/sprites/js/index.js
• PASS: node --check dev/tests/playwright/tools/SpritesToolShell.spec.mjs
• PASS: git diff --check for touched files
• PASS: targeted Sprite Creator Playwright spec

Artifact

• dev/workspace/zip/PR_26179_CHARLIE_033-sprites-canvas-preview-sync_delta.zip