fix root-level node creation and improve node operations

- bump workflowy to 2.8.2
- add bun patch for upstream bug (karelklima/workflowy#10)
  - root-level creates fail because parentid sent as "Root" instead of "None"
- add missing inputSchema to create_node tool
- add depth parameter to list_nodes (default 0, use -1 for unlimited)
- enable delete_node tool
- use recursive findNodeById for all operations (nested nodes now work)
- create_node returns JSON with nodeId

Author: sreuter