eyedine2/Classic-Steam-Library ? reverse-engineered prompt

Build me a Steam library skin that brings back the old 2013 and 2015 style look using CSS tweaks, not a full rollback.

I want it to make the library, friends list, and parts of the store and community feel like the classic Steam client again, with a cleaner layout, less visual noise, and the old news style activity feed. Please include the theme files and whatever custom CSS and JavaScript are needed so it can be dropped into Steam’s skins folder and used on the stable branch of Steam. If there are any parts that only work on stable and not beta, make that clear.

Keep it faithful to the old Steam feel, reduce clutter like oversized banners and achievement spam, and make sure it still feels usable with the current client. If you need to check current Steam skinning info online, go ahead.