I know that habit of using messenger app for notes :) Try [matrix] using Element or SchildiChat. It’s e2eencrypted and federated, and even supports markdown formatting in messages. Also some Slack features are included. The only issue for non-techy person might be verifying sessions - just be sure to use the same client on all devices.

Wow, this one hell of a monster will take a place of honor among my containers :) Thanks for sharing!

This + package to enable VSCode marketplace. The only VSCode features it lacks afaik are out of the box settings sync and remote container development, which colud be substituted with plugins.

EDIT: also be sure to check out Lapce suggested by Yote.zip - it’s a banger.