feat: add mobile dropdown page and search

open-isle-cli/src/utils/mobileDropdown.js

@@ -0,0 +1,15 @@
+import { reactive } from 'vue'
+
+const stores = reactive({})
+
+export function registerDropdownStore(id, store) {
+  stores[id] = store
+}
+
+export function getDropdownStore(id) {
+  return stores[id]
+}
+
+export function removeDropdownStore(id) {
+  delete stores[id]
+}