fix(kit): what installing the template into a real core showed

The template was built into a running core - MariaDB, the real loader, a browser
- and both halves of the walk passed: core reconciled two Teams out of the
provider on the first boot, /public/teams/<slug>/members came back with
projected:true, and the clan page rendered core's activity feed and forum in the
two slots this module declared. That last one is the whole point of the phase: a
module whose id is not "uo" now gets core's Team content, which is what
website#160 fixed. module-uo's own guild page was walked on the same core and is
unchanged.

Two things the walk found, both of the kind only a browser can:

PageHeader takes `lead`, not `subtitle`. The template has been passing subtitle
since it was written, and an unknown prop on a React component is silently
dropped - so every page built from this template rendered its heading with
nothing under it, on a site where every core page has a line there. Nothing warns
anywhere. Fixed on all three pages, and chapter 2 now says to check prop names
against 3.4 rather than guessing them, beside the paragraph about `shell` that
exists for exactly the same reason.

"1 members" on the clan list.

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

template/client/src/routes/public/WorldStatus.jsx

@@ -48,7 +48,12 @@ export default function WorldStatus() {
     <PublicLayout shell="narrow">
       <PageHeader
         title="World status"
-        subtitle="What the game server last told us about itself"
+        // `lead`, not `subtitle`. PageHeader takes `eyebrow`, `title`, `lead` and
+        // `center`, and an unknown prop on a React component is silently dropped —
+        // so a page written with `subtitle` renders its title and nothing else, on
+        // a site where every core page has a line under its heading. Nothing warns.
+        // Found by installing this template into a real core and looking at it.
+        lead="What the game server last told us about itself"
       />
 
       {loading && <Loading />}