bug: inconsistent behavior for unsupported TUI commands.

### Problem
CLI only commands have different behavior in the TUI.
- show up, but redirect the manual CLI run (ex. update).
- don't show up. (ex. export)

### Definition of Done
- migrate commands to a consistent behavior. (likely the second one since display a command to say its not supported feels like poor UX).

Compare how the TUI handles the CLI-only commands named in the issue, especially update and export. Trace their current TUI behavior first; done means unsupported commands follow one consistent behavior instead of showing or redirecting inconsistently.

Written by the indexing model from the issue text.