fix(editor): align canvas preview and export

[JimmyDaddy]

Summary

• keep Recipe v2 geometry in original-image coordinates through the Editor surface, bounded Core previews, and original export
• fix Web and React Native examples so text/image scaling is applied once and backgrounds are not cropped
• document sourceSize, publish generated projection API docs, and label the patch as Editor 0.0.3
• add unit and browser smoke coverage that compares Editor geometry with both preview and export pixels

Verification

• npm test -- --runInBand
• npm run typecheck
• npm run typecheck:example
• npm run lint
• npm --prefix packages/editor test
• npm --prefix packages/editor run build
• npm run verify:consumer
• npm --prefix website run build
• npm --prefix website run smoke
• desktop and 390px browser visual checks