Commit Red Bear OS icon and loading background images to the branding recipe source. Update .gitignore to exclude fetched tarballs, build artifacts, and target/ dirs inside local/recipes/ while preserving tracked source code.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
