Allow users to select a default task integration and task list

Currently, the Tasks view defaults to Morgen's task list, and integrations appear in the order they were added.

I use Notion to manage my tasks, so every time I open the Tasks view, I have to:

1. Open Tasks.

2. Switch from Morgen to Notion.

3. Select my preferred Notion task list from the dropdown menu.

It would be really helpful to have an option to set both a default task integration and a default task list, so the Tasks view automatically opens with my preferred selection.

This would save several unnecessary clicks every time I access my tasks.