fix: remove rootDir from non-build tsconfigs

ts-loader 9.5.7 stopped overriding rootDir to undefined in
transpileModule() calls, so the tsconfig's rootDir now flows
through. In npm workspace setups where node_modules is hoisted
above the package directory, this causes TS6059 errors because
hoisted files fall outside rootDir.

Since rootDir only controls output directory structure during
emit, it belongs in the build tsconfigs (which already inherit
it correctly), not in the base tsconfigs used by ts-loader.

Also regenerated package-lock files to pick up ts-loader 9.5.7.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: arbrandes