This stylelint-scss rule is useful because we were inconsistent when
using calc(); sometimes we added interpolation to Sass variables, and
sometimes we didn't. The reason why we originally added interpolation
was that it was necessary until we migrated to Dart Sass in commit
d54971e53. Since then, we can omit the interpolation, which is also what
the Sass documentation recommends [1].
[1] https://sass-lang.com/documentation/values/calculations/
We hadn't added this rule before because there was no such rule in
scss-lint. Instead, we were following it without a linter, and so we
unintentionally broke it sometimes.
But now we're using Stylelint, so we can add the rule and let the linter
check we're still following it.
The rows in these tables were using the styles from the `.poll`
selector, and the `position: relative` property defined there caused the
inner borders to disappear in some browsers (like Firefox).
So we're adding the `public` class to the selector; this way, it doesn't
affect elements in the admin section.
Even though it's only necessary to add the `.public` prefix to the
`.poll` selector in one place in order to fix this issue, we're doing it
everywhere for consistency.
This is consistent with the way we've got partials to render debates,
proposals and legislation processes on their index pages.
Note that, while adding the tests for the status icon, we're keeping one
system test because it also tests the process of voting. We're adding a
new, similar component test, where the voter is created in the database,
so all possible statuses are tested in the component.
