fix: follow relative paths in sync/copy feature

[Alex-Izquierdo]

Copy files in sync function does not honor relative paths, so you can define a config like:

[sync]
symlink = []
copy = [".claude/settings.local.json"]
ignore = []

But it is copied in the root of the project. This PR fixes the issue by ensuring relative paths are honored.

[Alex-Izquierdo]

any feedback @rohansx ?