Generated icon types no longer block merges

A dev server left running in the shared checkout kept rewriting the generated icon type file auto-imports.d.ts, and every merge into that checkout then failed on the local change. The file is no longer kept in git: Vite and the type check create it from the icons the code actually uses, so a running dev server can no longer get in the way. The generated list is also more accurate than the old committed one.