Show bookmark heart to all users, redirect to login if not authenticated

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/activities/components/BookmarkButton.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import { computed } from 'vue'
+import { useRouter } from 'vue-router'
 import { Button } from '@/components/ui/button'
 import { Heart } from 'lucide-vue-next'
 import { useAuth } from '@/composables/useAuthService'
@@ -15,6 +16,7 @@ const props = defineProps<{
   kind?: number
 }>()
 
+const router = useRouter()
 const { isAuthenticated } = useAuth()
 const { isBookmarked, toggleBookmark } = useBookmarks()
 
@@ -22,13 +24,16 @@ const activityKind = computed(() => props.kind ?? NIP52_KINDS.CALENDAR_TIME_EVEN
 const bookmarked = computed(() => isBookmarked(activityKind.value, props.pubkey, props.dTag))
 
 function handleToggle() {
+  if (!isAuthenticated.value) {
+    router.push('/login')
+    return
+  }
   toggleBookmark(activityKind.value, props.pubkey, props.dTag)
 }
 </script>
 
 <template>
   <Button
-    v-if="isAuthenticated"
     variant="ghost"
     size="icon"
     class="h-8 w-8"