next build runs ESLint + full type-check and fails on errors (not just
warnings) - the production build was broken. Fixes: unused imports/vars,
any-typed diff/preference lookups replaced with the actual union/Record
types, ternary-as-statement flagged by no-unused-expressions, unescaped
JSX entities, a UserPreferences interface missing two fields the video
editor already reads/writes at runtime, and an import of
ColumnVisibilityState which @tanstack/react-table does not export
(the real name is VisibilityState).
devil