feat: implement 2 free build limits and BYOK modal

feat: add Google OAuth Sign-In button to Auth page

feat: auth page redesign and full bug audit fixes

feat: add Supabase auth + 5 new pipeline stages

feat: PDF and DOCX stage/full-build reports for HITL and autonomous flow

feat: premium Claude-style UI for HITL approval cards and autonomous result screen

feat: add HITL webapp with 3 UX improvements

feat(core): integrate core modules, update UI and docs

feat: universal chip support, claude theme, and SFT logging export