Allow relative path or ${workspaceFolder} in custom storage path

[EricTheMagician]

I want to be able to store tasks in a path relative to our workspace folder.
Currently, the custom storage path setting requires an absolute path and does not support the ${workspaceFolder} interpolation.

This should also apply to everything that applies to the workspace.
I have some mcp's that are stored in my current repo and I would like to be able to have my commands in .roo/mcp.json use the paths local to my repo.