PR_26179_CHARLIE_039-sprites-color-and-zoom-fix

[ToolboxAid]

Summary

• Fix Sprite Creator center canvas selected-color rendering by strengthening painted color selectors.
• Add a 50% zoom option while preserving 100%, 200%, and 400%.
• Extend Playwright coverage to verify selected non-white colors match between center canvas and preview, exports still work, and 50% zoom does not change grid dimensions.

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: runtime guard scan for inline style/script/event handlers and stale placeholder copy
• PASS: npx playwright test dev/tests/playwright/tools/SpritesToolShell.spec.mjs --workers=1 --reporter=list

Artifact

• dev/workspace/zip/PR_26179_CHARLIE_039-sprites-color-and-zoom-fix_delta.zip