Add @babel/runtime and mini-css-extract-plugin back to ignoreDependencies

These dependencies are used by webpack but not detected by knip's analysis.
Adding them to ignoreDependencies prevents the "Unused dependencies" error.
(This will generate configuration hints, but hints don't fail CI.)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

knip.ts

@@ -176,6 +176,10 @@ const config: KnipConfig = {
         '@rescript/react',
         // The Babel plugin fails to detect it
         'babel-plugin-transform-react-remove-prop-types',
+        // Required by @babel/plugin-transform-runtime for polyfills (used by webpack)
+        '@babel/runtime',
+        // Used in webpack server config for CSS extraction
+        'mini-css-extract-plugin',
         // This one is weird. It's long-deprecated and shouldn't be necessary.
         // Probably need to update the Webpack config.
         'node-libs-browser',