feat: add colored sidebar support

[wwwillgunnn]

Overview

Adds support for Catppuccin colors in the Obsidian sidebar. Related to #158

Changes

• Adds sidebar color customization using Catppuccin theme colors
• Applies Catppuccin colors to sidebar folders and files
• Keeps existing defaults unchanged

[mbeckrich]

Looks good. Do you know how to work with the scss/base/_ctp-style-settings.scss file? It will need to be updated to bring this into Style Settings. Currently, the features are prefixed with 'Catppuccin - $Feature_Name. Docs are here: https://github.com/community-archive/obsidian-style-settings. Depending on what you have envisioned, you might be able to refer to the name: "Catppuccin: Font Styles" section of the scss file. I think it's using a similar logic to what you want, but maybe not. Let me know if you have any questions!