refactor(hunt): replace admin middleware with auth and implement membership state

- Change middleware from 'admin' to 'auth' on hunt and quest admin pages
- Add global hunt store to track current hunt ID and membership status
- Use hunt store membership state to conditionally display admin UI elements
- Handle fetch errors gracefully with alerts and back navigation buttons
- Update admin UI logic to depend on membership state instead of user role
- Add membership state update after API calls in hunt, quest, teams, and admin pages
- Refactor UI templates to show error messages when fetch fails
- Centralize membership logic for better authorization control in frontend

app/pages/hunt/[huntSlug]/index.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { parseError } from '#imports';
 import TeamAddModal from '~/components/TeamAddModal.vue';
+import { useHuntStore } from '~/stores/hunt';
 import { useSettingsStore } from '~/stores/settings';
 import { useTitleStore } from '~/stores/title';
 import { fullDate } from '~~/server/utils/date';
@@ -15,9 +16,12 @@ const { init } = useToast();
 const { name, id } = app.$slugData.huntSlug!;
 
 const titleStore = useTitleStore();
+const huntStore = useHuntStore();
 
 const { data, pending, refresh, error } = await useFetch(`/api/hunt/${id}`);
 
+huntStore.setMembership(id, data.value?.isMember ?? false);
+
 const settings = useSettingsStore();
 
 useHead({