Enable minimize option to Llama Dialog

[pdelboca]

WIP Fixes #1027

TODO:

• What should happen when the Dialog is minimized and the the user changes the dataset?

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[romicolman]

@pdelboca I've checked it. The minimize button implementation works OK. I've created a new ticket (issue #1040) to address the second scenario.

[romicolman]

I've checked this on Mac. Here is my feedback:

When you select a different dataset from the sidebar, the warning dialog pops up, but if you click on Cancel, you don't see the prompt dialog again.

This is the workflow that I suggest:

• The user clicks on a different dataset.
• The AI prompt dialog is maintain on the background.
• The warning dialog pops-up.
• If the user clicks on Cancel, the warning dialog disappears and the prompt one is kept.
• If the user clicks OK, the warning and the prompt dialogs are closed.

[romicolman]

Additional comment apart from the one above. The text in the AI dialog:

Adjustments:

Changing THE dataset will cancel the AI WORK. Do you want to proceed?

[romicolman]

Let's address this PR after the release.