/**
* SSR CSS Collection
*
* Collects CSS dependencies from Vite's module graph to prevent FOUC
* (Flash of Unstyled Content) during SSR development.
*
* In dev mode, Vite normally injects CSS via JavaScript on the client side.
* When SSR is enabled, the server-rendered HTML arrives before any JS executes,
* causing unstyled content to flash briefly. This module traverses the SSR
* environment's module graph starting from the entry to find all CSS
* dependencies, then generates tags so the browser fetches styles
* immediately with the initial HTML.
*
* The generated tags include `data-vite-dev-id` attributes so Vite's
* client JS can deduplicate them and avoid injecting duplicate