refactor uuidv7 to compact version

[cloverich]

after a bit of research, sticking with uuidv7 for the note filenames and merely dropping the hyphens; the uuidv7 package provides this via uuidv7obj().toHex(). Conveniently, their parsing function (UUID.parse) handle hyphenated and non-hyphenated versions equally well

closes #248

migrating existing note repositories

How to migrate existing notes? After thinking on it I realized the process will be effectively free:

• All new ids (notes and files) use non-hyphenated id (this PR)
• Implement Import from markdown (directory) #132
• Create a new Chronicles root, then import the old one (since its also a folder of plain markdown files)

Voila, I think it will Just Work? I guess will find out, too tired to think per usual. Amazing anything gets done on this project at all.