Rename the focus step and add a Custom task option

The first guided step sets the profile's Task (+ default skills), so it's the review focus, not a "type": retitle "What kind of review?" → "What should they review?".

Add "Custom… — describe your own task": picking it prompts for free-text that becomes the crew's shared task (saved under the custom profile). The current profile (including custom) is marked and pre-selected.