Restore editor content spacing and Support list navigation #85

Core Pages lose paragraph, heading, list, and separator spacing after Tailwind's reset. Nixo's Contact Us page reproduces this. Support Articles already carry content-body but Spark defines no corresponding styles.

Support category and index templates also omit the existing pagination partial and discard the displayed search term after submission.

Separately, Nixo reports a missing Returns & Refunds article. The live category shows the empty state. Spark's articles context matches the platform view; the view filters by category slug and is_public=True. Publication/category membership needs confirmation before attributing that symptom to Spark. Do not bypass publication filtering.