Expose UI customization APIs in Mods for custom frontend elements and styling

[DINOE-1]

Feature Description

Currently, the Mods API is powerful for extending CommandCode cli's logic, but it lacks the flexibility for users to customize the frontend UI. I would like to propose exposing more granular UI APIs so that Mods can inject, modify, or render custom UI elements and styles.

Use Case

As an example of what rich UI customization can achieve, tools like _Pi_ offer highly informative, modular layouts (see attached screenshot). The goal here is not to demand a "sidebar" specifically, but to have the capability to build similarly informative, custom UI blocks via the Mods system.

Additional Context

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[ObaidNadeem]

Thanks for creating the issue. I've a PR ready for tweaking the themes. This seems like a nice idea s well, will look into this.