Enhance user communication and improve UI components

- Update CLAUDE.md to mandate informal "Du" form for user communication in all UI text and emails.
- Modify LoginForm and RegisterForm components to reflect informal language in validation messages and placeholders.
- Add secure connection indicators in LoginForm for user awareness.
- Update alert component styles for better visual feedback.
- Introduce experimenta company information document for user reference.

.claude/settings.local.json

@@ -50,7 +50,8 @@
       "WebFetch(domain:docs.cidaas.com)",
       "WebFetch(domain:articles.cidaas.de)",
       "WebFetch(domain:pre-release-docs.cidaas.com)",
-      "mcp__playwright__browser_console_messages"
+      "mcp__playwright__browser_console_messages",
+      "WebFetch(domain:nuxt.com)"
     ],
     "deny": [],
     "ask": []