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/stores/hunt.ts

@@ -0,0 +1,14 @@
+export const useHuntStore = defineStore('hunt', () => {
+  const huntId = ref<number>();
+  const isMember = ref(false);
+
+  function setMembership(id: number, member: boolean) {
+    huntId.value = id;
+    isMember.value = member;
+  }
+
+  return { huntId, isMember, setMembership };
+});
+if (import.meta.hot) {
+  import.meta.hot.accept(acceptHMRUpdate(useHuntStore, import.meta.hot));
+}