Skip activities with invalid dates in calendar view

Prevents RangeError from format() on activities with unparseable
start timestamps.

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

src/modules/activities/components/ActivityCalendarView.vue

@@ -37,6 +37,7 @@ const calendarDays = computed(() => {
 const activityDayMap = computed(() => {
   const map = new Map<string, Activity[]>()
   for (const activity of props.activities) {
+    if (!activity.startDate || isNaN(activity.startDate.getTime())) continue
     const key = format(activity.startDate, 'yyyy-MM-dd')
     if (!map.has(key)) map.set(key, [])
     map.get(key)!.push(activity)

src/modules/activities/index.ts

@@ -56,7 +56,7 @@ export const activitiesModule = createModulePlugin({
       component: () => import('./views/ActivitiesFavoritesPage.vue'),
       meta: {
         title: 'Favorites',
-        requiresAuth: true,
+        requiresAuth: false,
       },
     },
     {

src/modules/activities/views/ActivitiesFavoritesPage.vue

@@ -1,7 +1,9 @@
 <script setup lang="ts">
-import { computed } from 'vue'
+import { computed, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { Heart } from 'lucide-vue-next'
+import { Button } from '@/components/ui/button'
+import { toast } from 'vue-sonner'
 import { useAuth } from '@/composables/useAuthService'
 import { useBookmarks } from '../composables/useBookmarks'
 import { useActivitiesStore } from '../stores/activities'
@@ -20,6 +22,17 @@ const favoriteActivities = computed(() => {
 function handleSelect(activity: Activity) {
   router.push({ name: 'activity-detail', params: { id: activity.id } })
 }
+
+onMounted(() => {
+  if (!isAuthenticated.value) {
+    toast.info('Log in to save favorites', {
+      action: {
+        label: 'Log in',
+        onClick: () => router.push('/login'),
+      },
+    })
+  }
+})
 </script>
 
 <template>
@@ -29,7 +42,10 @@ function handleSelect(activity: Activity) {
     <!-- Not authenticated -->
     <div v-if="!isAuthenticated" class="flex flex-col items-center justify-center py-16 text-center">
       <Heart class="w-16 h-16 text-muted-foreground/30 mb-4" />
-      <p class="text-muted-foreground">Log in to save your favorite activities</p>
+      <p class="text-muted-foreground mb-3">Log in to save your favorite activities</p>
+      <Button variant="outline" size="sm" @click="router.push('/login')">
+        Log in
+      </Button>
     </div>
 
     <!-- Loading -->