Gates keep the question nav

The qualifies and requires_chain gates replaced the whole page,
footer nav included - a visitor hitting one had only the wordmark as
a way out.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/app.rs

@@ -200,6 +200,7 @@ fn QuestionView(
     site: SiteConfig,
 ) -> impl IntoView {
     let question_id = question.id.clone();
+    let has_chain = parent_hash.is_some();
 
     // The provenance counterpart to the qualifies gate below: a
     // requires_chain page whose visitor holds no verifiable lineage to
@@ -226,6 +227,8 @@ fn QuestionView(
                     </a>
                 </section>
             </div>
+            // A gate is never a dead end: the same nav as every page.
+            <QuestionNav current_id=question_id has_chain=has_chain/>
         }
         .into_any();
     }
@@ -261,6 +264,7 @@ fn QuestionView(
                     }}
                 </section>
             </div>
+            <QuestionNav current_id=question_id has_chain=has_chain/>
         }
         .into_any();
     }
@@ -270,7 +274,6 @@ fn QuestionView(
     // on pages where some alternative actually declares a deck.
     let needs_swiper = question.alternatives.iter().any(|a| a.images.len() > 1);
 
-    let has_chain = parent_hash.is_some();
 
     view! {
         {needs_swiper.then(|| view! { <leptos_meta::Script src="/swiper-element-bundle.min.js"/> })}