fix(react): improve image component and demos

[wangdicoder]

Summary

• fix Image loading, fallback promotion, and ref behavior
• improve Image demos, including replayable placeholder and interactive size controls
• document native img ref behavior and add a patch changeset for @tiny-design/react

Release

• patch
• affected package: @tiny-design/react

Test plan

• pnpm --filter @tiny-design/react test -- image
• pnpm exec eslint packages/react/src/image/demo/Size.tsx packages/react/src/image/demo/Placeholder.tsx packages/react/src/image/demo/Lazy.tsx packages/react/src/image/demo/CustomFallback.tsx packages/react/src/image/demo/ImageStyle.tsx
• pnpm exec eslint packages/react/src/image/image.tsx packages/react/src/image/tests/image.test.tsx