nextcloud/assistant ? reverse-engineered prompt

Build me a Nextcloud Assistant app that adds a simple AI helper inside Nextcloud.

I want a new entry in the right side menu that opens an assistant panel where users can pick a task, enter text, and send it off. Some tasks should run right away, and longer ones should be queued in the background, then the user gets a notification when the result is ready. The results should be easy to view again from that notification or inside the assistant.

It should support the kinds of AI tasks Nextcloud already talks to, like summarizing text, extracting topics, generating a headline, free form prompts, rewriting text, chat, image generation, and speech to text, depending on which provider apps are installed.

Also make it work nicely from other apps, especially Text, so a user can select a paragraph and launch the assistant with the text already filled in and the task already chosen. If you need to, look up the current Nextcloud docs and patterns before wiring it up.