Add try/catch to gracefully handle errors when setting privileged
modes (yolo/auto-edit) in untrusted folders, returning an error
message instead of throwing.
- Remove persistence to user settings (no setValue call)
- Only use config.setApprovalMode() for session scope
- Remove autocomplete feature for simplicity
- Align with Shift+Tab behavior
Allow users to set approval mode directly via argument instead of
opening the dialog. For example:
- /approval-mode plan
- /approval-mode yolo
- /approval-mode auto-edit
- /approval-mode default
If no argument is provided, the dialog opens as before.
If an invalid argument is provided, an error message shows valid options.
Also adds tab completion for mode arguments.
Fixes#1353
