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/planner/app/entry.client.tsx

@@ -1,30 +1,8 @@
-import * as Sentry from "@sentry/react";
-import { useEffect } from "react";
 import { startTransition, StrictMode } from "react";
 import { hydrateRoot } from "react-dom/client";
 import { HydratedRouter } from "react-router/dom";
-import { useLocation, useNavigationType, createRoutesFromChildren, matchRoutes } from "react-router";
 import { initI18nClient } from "@trails-cool/i18n";
 
-const sentryEnvironment = import.meta.env.VITE_SENTRY_ENVIRONMENT ??
-  (import.meta.env.PROD ? "production" : "development");
-
-Sentry.init({
-  dsn: "https://5215134cd78d5e6c199e29300b8425af@o4509530546634752.ingest.de.sentry.io/4511102546608208",
-  integrations: [
-    Sentry.reactRouterV7BrowserTracingIntegration({
-      useEffect,
-      useLocation,
-      useNavigationType,
-      createRoutesFromChildren,
-      matchRoutes,
-    }),
-  ],
-  environment: sentryEnvironment,
-  tracesSampleRate: sentryEnvironment === "ci" ? 0 : 1.0,
-  enabled: import.meta.env.PROD && sentryEnvironment !== "ci",
-});
-
 initI18nClient();
 
 startTransition(() => {

apps/planner/app/routes/home.tsx

@@ -61,6 +61,9 @@ export default function Home() {
     <div className="flex h-full flex-col overflow-y-auto">
       {/* Hero */}
       <section className="flex flex-1 flex-col items-center justify-center px-4 py-16">
+        <span className="mb-4 inline-block rounded-full bg-amber-100 px-3 py-1 text-xs font-medium uppercase tracking-wide text-amber-800">
+          {t("landing.footer.alpha")}
+        </span>
         <h1 className="text-5xl font-bold tracking-tight text-gray-900 sm:text-6xl">
           {t("title")}
         </h1>
@@ -129,11 +132,20 @@ export default function Home() {
       {/* Footer */}
       <footer className="border-t border-gray-200 px-4 py-6">
         <div className="mx-auto flex max-w-4xl flex-wrap items-center justify-between gap-4 text-sm text-gray-400">
-          <span>{t("landing.footer.builtWith")}</span>
+          <span>
+            {t("landing.footer.builtWith")}
+            <span className="ml-2 text-xs">· {t("landing.footer.alpha")}</span>
+          </span>
           <div className="flex gap-4">
-            <a href="https://trails.cool/privacy" className="hover:text-gray-600">
+            <a href="https://trails.cool/legal/imprint" className="hover:text-gray-600">
+              {t("landing.footer.imprint")}
+            </a>
+            <a href="https://trails.cool/legal/privacy" className="hover:text-gray-600">
               {t("landing.footer.privacy")}
             </a>
+            <a href="https://trails.cool/legal/terms" className="hover:text-gray-600">
+              {t("landing.footer.terms")}
+            </a>
             <a href="https://github.com/trails-cool/trails" className="hover:text-gray-600">
               {t("landing.footer.source")}
             </a>