- Add getCoverImage function in utils.ts to handle different cover image formats
- Update MarkdownPost.astro to use getCoverImage for consistent image handling
- Update MoreTile.astro to use getCoverImage and remove direct CA_LOGO_URL import
- Update preview.png
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>