Refactor secure connection handling in LoginForm component

- Change isSecureConnection from computed to ref and initialize it on component mount.
- Wrap secure connection status messages in ClientOnly to prevent rendering issues during server-side rendering.

app/components/Auth/LoginForm.vue

@@ -39,8 +39,9 @@ const onSubmit = handleSubmit(async (values) => {
 })
 
 // Is the connection secure?
-const isSecureConnection = computed(() => {
+const isSecureConnection = ref(false)
-  return window.location.protocol === 'https:'
+onMounted(() => {
+  isSecureConnection.value = window.location.protocol === 'https:'
 })
 </script>
 
@@ -80,6 +81,7 @@ const isSecureConnection = computed(() => {
       {{ isSubmitting ? 'Wird angemeldet...' : 'Anmelden' }}
     </Button>
 
+    <ClientOnly>
       <!-- Secure Connection Text -->
       <p v-if="!isSecureConnection" class="flex items-center justify-center gap-2 text-sm text-white/70">
         <ShieldAlert :size="16" class="flex-shrink-0 text-error" />
@@ -89,6 +91,7 @@ const isSecureConnection = computed(() => {
         <ShieldCheck :size="16" class="flex-shrink-0 text-success" />
         <span class="text-success">Die Datenübertragung erfolgt verschlüsselt</span>
       </p>
+    </ClientOnly>
 
   </form>
 </template>