feat: enhance public notes functionality with flexible options

- Make public notes optional to prevent default values causing frontend issues
- Add dual editing modes: raw text editing and custom fields (avoid hardcoded schema)
- Set raw text mode as default, populate input on edit, submit raw text content always
- Add toggle switch: submit raw text when enabled, submit empty & hide controls when disabled
- New records default to disabled public notes; auto-expand on edit based on content

Author: Chillln