The text for the unfeasible checkbox wasn't correctly defined as a
label, while the fields to search investments and select the heading
weren't intuitive since their purpose wasn't obvious.
With a 50% width on medium and large screens, depending on the size of
the text and the size of the screen, the label could unnecessarily use
two rows, looking broken.
The `use_helpers` method was added in ViewComponent 3.8.0, and it's
included by default in all components since version 3.11.0.
Note we sometimes delegated the `can?` method to the controller instead
of the helpers, for no particularly reason. We're unifying that code as
well.
