- Use crypto.getRandomValues for GUID generation
- Use SHA1 checksum for consistent hashing
- Add proper deep cloning for note type fields/templates
- Improve unique ID generation with timestamp XOR random
- Add file size validation for APKG uploads
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>