- Renamed 'stream-item' component to 'user-stream-item'
- Replaced generic 'item' class with clearer 'user-stream-item' class
- Retained 'item' class for backward compatibility, marked as 'DEPRECATED'
- Extracted CSS pertaining 'user-stream-item' component to component CSS files
- Removed unnecessary duplication from 'user-stream-item' CSS
- Removed unnecessary nesting from 'user-stream-item' CSS