Add legal pages, ToS acceptance, and alpha banner

- Journal: Impressum (§5 TMG), Terms of Service, GDPR privacy page
- Registration flow: required ToS checkbox, termsAcceptedAt persisted
- Alpha banner on Journal (always visible); alpha badge on Planner hero
- Footer with legal links + GitHub on both apps
- Reduce PII: sendDefaultPii=false, Sentry init only after login (Journal)
- Drop Sentry from Planner (no login, no consent possible)
- Drop localStorage caching from i18n client detection
- Sync SSR i18n resources each request so locale edits HMR without restart

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

apps/journal/app/root.tsx

@@ -7,6 +7,9 @@ import { useTranslation } from "react-i18next";
 import { detectLocale } from "@trails-cool/i18n";
 import { getSessionUser } from "~/lib/auth.server";
 import { LocaleProvider } from "~/components/LocaleContext";
+import { AlphaBanner } from "~/components/AlphaBanner";
+import { Footer } from "~/components/Footer";
+import { initSentryClient } from "~/lib/sentry.client";
 import stylesheet from "@trails-cool/ui/styles.css?url";
 
 export const links: LinksFunction = () => [{ rel: "stylesheet", href: stylesheet }];
@@ -116,7 +119,8 @@ export default function App({ loaderData }: Route.ComponentProps) {
   const locale = loaderData?.locale ?? "en";
   useEffect(() => {
     if (user) {
-      Sentry.setUser({ id: user.id, username: user.username });
+      initSentryClient();
+      Sentry.setUser({ id: user.id });
     } else {
       Sentry.setUser(null);
     }
@@ -124,8 +128,10 @@ export default function App({ loaderData }: Route.ComponentProps) {
 
   return (
     <LocaleProvider locale={locale}>
+      <AlphaBanner />
       <NavBar user={user ?? null} />
       <Outlet />
+      <Footer />
     </LocaleProvider>
   );
 }