✨ Introduce serve_zip action and update routes

Add serve_zip action to handle zip file downloads, incrementing the
download count and providing appropriate redirects. Update routes
to include serve_zip and modify views for new download link.

💄 Update media grid and thumbnail overlay styles

Refine the layout and appearance of media items for improved UI consistency.

💄 Update chart label formatting

Change chart label to display absolute values followed by the label in lowercase for improved readability.