- main.js: drop @sentry/browser + @sentry/vue init.
- webpack.config.prod.js: drop sentryWebpackPlugin (and its dotenv/env
plumbing that only served Sentry release/source-map upload).
- package.json: remove @sentry/browser, @sentry/vue, @sentry/webpack-plugin.
Note: run 'npm install' to update package-lock before the next build.