chore(deps): upgrade to ESLint 10

[jdmanring]

PR #64. Depends on: #69.

eslint 9→10, typescript-eslint 8.30→8.62. Replaces eslint-plugin-import with eslint-plugin-import-x@4.17.0 (ESM fork). Uses @eslint/compat for React plugin (scoped to .tsx). Rule prefixes updated import/ → import-x/.

3 files: eslint.config.js, package.json, lockfile.