[jp-sync] Sync JP avatar xplat topic with EN updates

[github-actions]

Original author: Ivan Minchev 61944284+IMinchev64@users.noreply.github.com

Summary

Synced the Japanese avatar documentation topic with the recently updated English source.

Files processed

English source	Japanese counterpart
docs/xplat/src/content/en/components/layouts/avatar.mdx	docs/xplat/src/content/jp/components/layouts/avatar.mdx

What changed

The English avatar topic was completely rewritten in commit 66a48ed ("feat(docs): update avatar xplat topic (#450)"). The Japanese file has been updated to mirror the new English structure:

• Frontmatter: Updated title, description, keywords; added last_updated, relatedComponents, updated mentionedTypes and llms.description; preserved _language: ja.
• New imports: Added Anatomy, Faq, FaqItem, Image, and image asset imports.
• New sections: Added Live Demo, Anatomy, Getting Started (per-platform), Variants, Do/Don't guidance table, Properties table, Styling (CSS variables + CSS parts tables), Sass Theming, CSS Variables, Tailwind styling, Accessibility (keyboard, ARIA, compliance tables), Troubleshooting, Dependencies, Related Components, FAQ.
• All English prose translated into natural Japanese; code blocks, import statements, JSX component tags, API names, URLs, and {Token} placeholders preserved verbatim.

Generated by Sync Japanese Documentation (xplat) · 72.2 AIC · ⌖ 12.6 AIC · ⊞ 8.2K · ◷