diff --git a/src/modules/activities/composables/useActivityFilters.ts b/src/modules/activities/composables/useActivityFilters.ts
index 8f9914b..a5ae1da 100644
--- a/src/modules/activities/composables/useActivityFilters.ts
+++ b/src/modules/activities/composables/useActivityFilters.ts
@@ -8,35 +8,22 @@ import type { ActivityCategory } from '../types/category'
 import type { TemporalFilter, ActivityFilters } from '../types/filters'
 import { DEFAULT_FILTERS } from '../types/filters'
 
+// Filter state is hoisted to module scope so every `useActivities()` /
+// `useActivityFilters()` call shares the same refs. The bottom-nav
+// Hosting tab in activities-app/App.vue and the feed view in
+// ActivitiesPage.vue both rely on this — without a shared instance,
+// tapping Hosting toggled a private ref the page never saw.
+const temporal = ref<TemporalFilter>(DEFAULT_FILTERS.temporal)
+const selectedCategories = ref<ActivityCategory[]>([])
+const selectedDate = ref<Date | undefined>(undefined)
+const onlyOwnedTickets = ref(false)
+const onlyHosting = ref(false)
+const showPast = ref(false)
+
 /**
  * Composable for managing activity filter state and applying filters reactively.
  */
 export function useActivityFilters() {
-  const temporal = ref<TemporalFilter>(DEFAULT_FILTERS.temporal)
-  const selectedCategories = ref<ActivityCategory[]>([])
-  const selectedDate = ref<Date | undefined>(undefined)
-  /**
-   * When true, the feed is narrowed to activities the current user
-   * holds at least one paid ticket for. Crossed with the
-   * `ownedActivityIds` set from useOwnedTickets in useActivities
-   * (this composable stays free of ticket fetching).
-   */
-  const onlyOwnedTickets = ref(false)
-  /**
-   * When true, the feed is narrowed to activities the current user
-   * is hosting (organizer pubkey matches the signed-in user, or the
-   * row is a local LNbits draft of theirs). Reads `activity.isMine`
-   * which `useActivities.tagOwnership()` populates.
-   */
-  const onlyHosting = ref(false)
-  /**
-   * When false (default), activities that have already ended are
-   * hidden from the feed. Toggling on includes them so the user can
-   * browse past events. The date-picker overrides this — picking a
-   * specific past date shows that day's activities regardless,
-   * mirroring how it overrides the temporal pills.
-   */
-  const showPast = ref(false)
 
   const filters = computed<ActivityFilters>(() => ({
     temporal: temporal.value,