Update item list dynamically when fetching with local account

Currently, when fetching RSS feeds with a local account, the application waits for all the responses and then updates the list. If one of the feeds goes into maintenance mode, you may be stuck with an empty list for a while (I'm not sure about the timeout), even if all other feeds have responded correctly. I think having the article list update asynchronously on each successful feed data retrieval would improve usability, especially in such edge cases where some feeds take longer to update. In other words, I want the local account fetch to work the same way as when updating data from the Fever API, which updates the article list dynamically.

No file or test is named. Start by tracing the local-account RSS fetch and comparing it with the Fever API update path, focusing on when each successful feed response updates the article list. Done means the list updates incrementally for local accounts instead of waiting for every feed response.