Beta Feedback: Allow selecting specific Variants as "Preferred instances" for Slots

Problem: When defining "Preferred instances" for the new native Slots, we can only select base Component Sets. Inserting one always loads the default variant, requiring extra clicks to reach the desired state.

Request: Please allow us to pin specific variants (e.g., State = Active) directly in the preferred instances list.

Why: Saves clicks, provides strict guardrails, and clarifies exactly which variant is intended for that slot right out of the box.