Assistant markdown images with ~-prefixed paths hit ENOENT because
path.resolve doesn't expand ~, leaving paths like
workspaceRoot/~/rest-of-path that never resolve. Reuse the existing
resolvePathFromBase helper so tilde paths inside the workspace load
instead of getting stuck on the image spinner; the sandbox check still
rejects tilde paths that resolve outside the workspace.
Mohamed Boudra
a001c72726