Function insert_string 

fn insert_string(_: ())

Prompt the user to select a [fkr::FkrOption] and insert its generated string.

The user is shown a selection menu via ytil_noxi::vim_ui_select::open; on selection the corresponding generated string is inserted at the cursor using ytil_noxi::buffer::BufferExt::set_text_at_cursor_pos.

Behaviour:

• Returns early (no insertion) if fetching user input fails or is canceled.
• Emits error notifications to Nvim for selection prompt or buffer write failures.