:sparkles: Add modal image viewer

[foysalit]

This PR introduces a lightbox plugin to open images within a modal instead of opening them in a new tab. This allows moderators to view and navigate images in full size. The plugin being used is https://yet-another-react-lightbox.com/

While testing, I also found a few UI issues with text color being off in some places so those were fixed too.

Screenshot from a post's image being opened in lightbox showing thumbnails and alt text as caption

[render[bot]]

Your Render PR Server URL is https://ozone-staging-pr-134.onrender.com.

Follow its progress at https://dashboard.render.com/web/srv-cpma1e1u0jms739bfuq0.

[render[bot]]

Your Render PR Server URL is https://ozone-sandbox-pr-134.onrender.com.

Follow its progress at https://dashboard.render.com/web/srv-cpma1ehu0jms739bfv8g.