Suggestions: Support for nested groups & direct preview screen navigation

[oleginvoke]

Hi Showkase team, thank you for your great work — Showkase is a very helpful tool for working with design systems in Compose. I have two suggestions that could improve the developer experience further:

1. Support for nested groups.
   Would it be possible to add support for hierarchical (nested) grouping of components?
   This would be particularly useful for teams following Atomic Design principles, where components are organized into levels such as Atoms, Molecules, Organisms, etc. Right now, only one level of grouping is supported, which limits the structure when working with larger design systems.

2. Skip style selection screen when only one style is present
   Currently, when a component has only one style (Default Style), navigation still requires selecting it manually before reaching the actual preview screen (with Light Mode / Dark Mode / RTL / Font Scaling).
   In most cases, we only have a single style, and this intermediate step feels redundant.
   Would it be possible to automatically skip the style selection screen and go directly to the preview screen when only one style is available? This would streamline navigation and reduce friction when exploring components.