feat: improve email invitation label for clarity and add navigation on guest join

src/i18n/de.json

@@ -518,7 +518,7 @@
     "addressLabel": "Benutzeradresse",
     "addressPlaceholder": "@benutzer@andere-instanz.com",
     "addressHint": "Format: @Benutzername@Domain der Redlight-Instanz",
-    "emailLabel": "Oder per E-Mail einladen",
+    "emailLabel": "Per E-Mail einladen",
     "emailPlaceholder": "name@beispiel.de, name2@beispiel.de",
     "emailHint": "Eine oder mehrere E-Mail-Adressen, durch Komma getrennt",
     "messageLabel": "Nachricht (optional)",

src/i18n/en.json

@@ -518,7 +518,7 @@
     "addressLabel": "User address",
     "addressPlaceholder": "@user@other-instance.com",
     "addressHint": "Format: @username@domain of the Redlight instance",
-    "emailLabel": "Or invite by email",
+    "emailLabel": "Invite by email",
     "emailPlaceholder": "name@example.com, name2@example.com",
     "emailHint": "Enter one or more email addresses, separated by commas",
     "messageLabel": "Message (optional)",

src/pages/GuestJoin.jsx

@@ -1,5 +1,5 @@
 import { useState, useEffect, useRef } from 'react';
-import { useParams, Link, useSearchParams } from 'react-router-dom';
+import { useParams, Link, useSearchParams, useNavigate } from 'react-router-dom';
 import { Video, User, Lock, Shield, ArrowRight, Loader2, Users, Radio, AlertCircle, FileText, Clock, X } from 'lucide-react';
 import BrandLogo from '../components/BrandLogo';
 import api from '../services/api';
@@ -11,6 +11,7 @@ import { useBranding } from '../contexts/BrandingContext';
 export default function GuestJoin() {
   const { uid } = useParams();
   const [searchParams] = useSearchParams();
+  const navigate = useNavigate();
   const { t } = useLanguage();
   const { user } = useAuth();
   const { imprintUrl, privacyUrl } = useBranding();
@@ -60,6 +61,17 @@ export default function GuestJoin() {
 
   useEffect(() => {
     const fetchRoom = async () => {
+      // If logged in, check if user owns or has access to this room
+      if (isLoggedIn) {
+        try {
+          await api.get(`/rooms/${uid}`);
+          navigate(`/rooms/${uid}`, { replace: true });
+          return;
+        } catch {
+          // User doesn't have access — continue as guest
+        }
+      }
+
       try {
         const res = await api.get(`/rooms/${uid}/public`);
         setRoomInfo(res.data.room);