User can customize their user configuration in the app

[frogr]

Goal
Build the admin interface that lets users edit their configuration through a web UI.

• Create HubAdmin::ConfigurationController
• Build configuration form with all options
• Add live preview functionality
• Implement one-click regeneration
• Add validation and error handling
• Style admin interface

Admin Interface Features

Form sections for: App Identity, Products, Plans, Design
Color picker for design system colors
Dynamic product/plan management (add/remove)
Live preview of changes
"Apply Changes" button that triggers regeneration
Success/error feedback

namespace :hub_admin do
  resource :configuration, only: [:show, :update]
end

• User can edit all configuration options via web form
• Form validates input and shows helpful errors
• "Apply Changes" triggers file transformation
• Success message confirms changes applied
• Interface is intuitive and well-styled