The variable was referenced at line 484 (the single-target create branch)
but never declared, so every non-clone add path (Add button, Cmd+Enter,
Open in Finder, mobile add) threw a ReferenceError that surfaced as a
'Failed to select directory' toast. Add the missing local declaration
matching the condition the original review intended: !isCloneMode &&
shouldCreateTarget && the target path equals the user-typed path.