[Feature]: Encrypt/decrypt Markdown files

[timashan]

Is your feature request related to a problem? Please describe

ZenNotes currently has no built-in way to protect sensitive MD notes. Users need to store notes as plain text or rely on another application for encryption.

Describe the solution you'd like

Add support for encrypting and decrypting MD files directly in ZenNotes. Ideally, this would include:

• Encrypting individual notes with a password.
• Prompting for the password when opening an encrypted note.
• Decrypting the note only in memory.
• Allowing the note to be edited and re-encrypted when saved.
• Keeping decrypted content out of temporary files, previews, search indexes, & logs.

Suggested Reference / Resource

For implementation ideas & expected behaviour, check out:

👉 Meld Encrypt

This Obsidian plugin demonstrates how encrypted MD notes can be unlocked, edited, & securely encrypted again.

Additional context

This feature would make ZenNotes more suitable for storing private or sensitive notes while keeping the MD-based workflow.