fix: await IndexedDB cache clear on inbox deletion

app/javascript/dashboard/api/CacheEnabledApiClient.js

@@ -87,7 +87,7 @@ class CacheEnabledApiClient extends ApiClient {
   async clearDataInCache() {
     try {
       await this.dataManager.initDb();
-      this.dataManager.db.clear(this.cacheModelName);
+      await this.dataManager.db.clear(this.cacheModelName);
     } catch {
       // Ignore error
     }

app/javascript/dashboard/store/modules/inboxes.js

@@ -325,7 +325,7 @@ export const actions = {
       await InboxesAPI.delete(inboxId);
       commit(types.default.DELETE_INBOXES, inboxId);
       // Clear IndexedDB so stale inbox data isn't served on page refresh
-      InboxesAPI.clearDataInCache();
+      await InboxesAPI.clearDataInCache();
       commit(types.default.SET_INBOXES_UI_FLAG, { isDeleting: false });
     } catch (error) {
       commit(types.default.SET_INBOXES_UI_FLAG, { isDeleting: false });