### **[Customization] Add Theme Customization for Tree Visualization**

[12mv2]

Description

Enable users to define custom themes for the tree visualization in addition to the existing dark and light themes.

Task Requirements

• Extend the current theme options with a customizable theme.
• Users should define colors for nodes, text, links, and background via JSON.

Steps

1. Add a "custom" theme option in the configuration.
2. Parse and apply user-defined colors in the Dendrogram.
3. Test with various custom themes to ensure visual consistency.

Definition of Done

• Users can define and apply custom themes without issues.
• Light and dark themes remain unaffected.

Branch

44-custom-theme-visualization