FiveM NUI HTML/CSS/JS interfaces for FiveM: manifest setup, Lua-to-browser messages, NUI callbacks and focus handling. Activation Contract Load this skill when the user asks to create or edit a FiveM UI, writes HTML/CSS/JS inside a resource, sets , or asks about , or . Hard Rules - Declare and include every UI file in in ; a missing file silently fails to load. - Reference assets with ; the protocol is deprecated. - handlers must ALWAYS call (at least ), or the browser request hangs. - Browser calls callbacks with ; the URL name must match the registered name exactly. - : always call when clo…