fix: every branch of the marks label counts the marks it can see, so the counts read alike

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ui.cpp

@@ -3406,7 +3406,7 @@ void place_search_marks(App& app) {
                     "%zu of %zu in view \xE2\x80\x94 the selected hit is outside the window", shown,
                     hits.size());
     } else {
-      std::snprintf(text, sizeof(text), "%zu of %zu in view", xs.size(), hits.size());
+      std::snprintf(text, sizeof(text), "%zu of %zu in view", shown, hits.size());
     }
     gtk_label_set_text(GTK_LABEL(app.search_marks_label), text);
   }