- Removed duplicate @typescript-eslint/utils dependency in frontend/package.json
- Updated TypeScript version from 5.9.3 to 6.0.1-rc in frontend/package.json and package.json
- Adjusted ResizeObserver mock to use globalThis in tests
- Modified tsconfig.json and tsconfig.node.json to include empty types array
- Cleaned up package-lock.json to reflect TypeScript version change and updated dev dependencies