Three icon conventions in one app, and the copy-pasted one is on every sign-in screen

Counting the icons in a Next.js app: 62 glyphs from lucide across 50 files, one from react-icons for a brand mark, and one chevron hand-pasted into six files as raw path data. What each costs on disk, what none of them cost in the browser, and how to tell them apart in the delivered HTML.