feat(theming): land Ant Design v5 overhaul — dynamic themes, real dark mode + massive styling refactor (#31590)

Co-authored-by: Enzo Martellucci <52219496+EnxDev@users.noreply.github.com>
Co-authored-by: Diego Pucci <diegopucci.me@gmail.com>
Co-authored-by: Mehmet Salih Yavuz <salih.yavuz@proton.me>
Co-authored-by: Geido <60598000+geido@users.noreply.github.com>
Co-authored-by: Alexandru Soare <37236580+alexandrusoare@users.noreply.github.com>
Co-authored-by: Damian Pendrak <dpendrak@gmail.com>
Co-authored-by: Pius Iniobong <67148161+payose@users.noreply.github.com>
Co-authored-by: Enzo Martellucci <enzomartellucci@gmail.com>
Co-authored-by: Kamil Gabryjelski <kamil.gabryjelski@gmail.com>