Search-term nodes created via % are now modifiable: e renames the
selected node (prefilled overlay; the new title re-runs the search,
colliding titles merge) and d deletes it, both gated on new additive
LibraryNodeChild.is_editable/is_deletable flags and marked [ed] in the
library list. Two new rpcs follow the create contract: RenameLibraryNode
returns the renamed node (the TUI navigates into it), DeleteLibraryNode
returns the refreshed parent listing. Queued tracks from a renamed or
deleted term keep playing; verified end-to-end against the live API.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
333c6e040a