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This change adds support for creating groups of widget previews. Previews with the same `group` parameter will be grouped together in a collapsable tile in widget previewer. Previews without a provided `group` will be placed in the `Default` group. This change also slightly reworks the UI to make individual previews more easily distinguishable from preview groups, moves the controls for the previewer to the bottom of the preview window, and adds a divider between the preview name and preview content if a name is provided. Fixes https://github.com/flutter/flutter/issues/173871 **Example:** <img width="767" height="640" alt="image" src="https://github.com/user-attachments/assets/80dc202c-77d3-42a5-be9d-e0d9a9a0f28b" />