v3: journal becomes the default feed tab for visitors and for users who haven't picked one

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

src/components/CategorySwitcher.tsx

@@ -9,6 +9,7 @@ import { createPortal } from "react-dom";
 import { useNavigate, useParams } from "react-router";
 import { t } from "@lingui/core/macro";
 import { useCategories } from "../hooks/useCategories.ts";
+import { DEFAULT_FEED_TAB } from "../config/feedTabs.ts";
 
 /**
  * Header dropdown that switches the feed scope between "All" and a category,
@@ -73,7 +74,7 @@ export function CategorySwitcher() {
   if (categories.length === 0) return null;
 
   const value = categorySlug ?? "~";
-  const tab = feedTab ?? "hot";
+  const tab = feedTab ?? DEFAULT_FEED_TAB;
   const currentLabel = categorySlug
     ? categories.find((c) => c.slug === categorySlug)?.name ?? categorySlug
     : t`All`;