Add image model selection to the Generate Image popup

In the Generate Image popup window, there is currently no option to select between different image generation models such as Nano Banana, Flux, or others. Users are limited to the Firefly Model without visibility or control over which model is being used unlike on Firefly Web.

I propose adding a model selector directly within the Generate Image dialog, allowing users to choose the generation model based on their needs, such as realism, illustration style, speed, or experimental output.

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