Remove Selected Media Files When Adding a New Post

[Alpha17-2]

Description

Implement a function that allows users to remove selected media files while creating a new post. This feature should enable users to easily manage and edit the media files they wish to include before finalising their post.

Requirements

• Add a UI component (e.g., a "X" button) to each selected media file thumbnail in the new post creation screen.
• Implement functionality to remove the selected media file from the post when the "Remove" button is clicked.
• Ensure the remaining media files are correctly displayed and updated in real-time.