refactor: restructure landing page with component extraction and fix Server Component hooks

- Extract reusable components: EnterOrSignInButton, paragraphFormatFactory, getProviders
- Fix React hooks usage: remove useMemo from async Server Components
- Update landing page content for Croatian and English translations
- Reorganize terms/policy pages into locale-aware directories
- Update PageFooter to use locale-aware links and make component async

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

messages/en.json

@@ -18,9 +18,7 @@
   },
   "login-page": {
     "main-card": {
-      "title-1": "Which bills are due?",
-      "title-2": "Which are payed?",
-      "title-3": "How much are my expenses?",
+      "title": "Bill management made easy<indigo> for landlords</indigo>",
       "text-1": "These are the questions this simple and free app will help you with ...",
       "text-2": "... try it & use it completly free!",
       "go-to-app": "Go to the App",