v2.3.2 ESLint cleanup and the genuine errors it surfaced (MR !161). - Config: demote airbnb style rules to warnings (14,895 -> 0 errors); ignore vendored assets; declare jest/browser globals. CI-only, no runtime effect. - Fixes: latent bugs the linter had buried (undefined refs in FetchDataSaga, ChangePassword, Header, tape, SteemMarket, App, ...), all behavior-preserving.