feat: upload voice recording + smart profile + auto-skip to Pick Song

feat: idiot-proof UX overhaul for complete beginners

copy: rewrite all UI text in plain English for non-musicians

feat: full chord diagram library + smart capo advisor + prominent chord flow

chore: enable Pro mode for testing

feat: add Play & Sing mode — simultaneous audio playback + mic voice tracking

docs: add CLAUDE.md and tasks directory

feat: initial VoiceKey app — real-time vocal range detection and song transposition