[FEATURE REQUEST] Add Color Theme Support in Snapshots

[iamkartiknayak]

Currently, the snapshot feature in Cosmic Tweaks allows users to save and load specific layouts (Windows, macOS, or Cosmic). However, the saved snapshots do not include the color theme that was active at the time the snapshot was taken.

This enhancement would add support for saving and restoring the color theme along with the layout when creating or loading a snapshot.