- Changed asset paths from `/public/assets` to `/public/upload` across various files to ensure consistency in media storage.
- Introduced visibility handling for posts, allowing for better control over comment visibility based on post status.
- Enhanced markdown export functionality with new utilities for exporting unlisted posts and normalizing image URLs.
- Updated tests to reflect changes in asset paths and visibility logic.
These updates improve the overall media management and user experience in handling post visibility and markdown exports.
