Stop Sentry on logout; fix E2E + Dockerfile for merged consolidation

- sentry.client.ts: add stopSentryClient() that awaits Sentry.close() so
  the SDK tears down when a user logs out. Hub methods become no-ops
  until initSentryClient() is called again on next login.
- root.tsx: call stopSentryClient() from the user-effect when user === null.
- Add sentry-config to journal + planner Dockerfiles (was missing after
  #237 introduced the new workspace package, breaking the Dockerfile
  package check).
- Footer: replace inner <nav> with <div> — nested nav landmarks broke
  the journal "nav bar shows on all pages" e2e test (two navigation
  roles on the page).
- e2e auth: tick the required ToS checkbox in the shared registerUser
  helper so passkey registration tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/journal/app/components/Footer.tsx

@@ -5,7 +5,7 @@ export function Footer() {
   return (
     <footer className="mt-16 border-t border-gray-200 bg-white">
       <div className="mx-auto max-w-7xl px-4 py-6 text-sm text-gray-500">
-        <nav className="flex flex-wrap items-center gap-x-6 gap-y-2">
+        <div className="flex flex-wrap items-center gap-x-6 gap-y-2">
           <a href="/legal/imprint" className="hover:text-gray-700">
             {t("footer.imprint")}
           </a>
@@ -26,7 +26,7 @@ export function Footer() {
           <span className="ml-auto text-xs text-gray-400">
             {t("footer.alpha")}
           </span>
-        </nav>
+        </div>
       </div>
     </footer>
   );