feat: Implement Seven-Step Progress Bar Component with Mock Control

[clackyai-staging-app]

Introduces a new interactive seven-step progress bar component with mock progress control functionality.

Key Changes

• Created new progressbar.mjs module implementing a seven-step progress bar component
• Updated style.css with progress bar styles and responsive layout rules
• Modified index.html to integrate the progress bar component and mock control button

Rationale

This implementation provides a visual way to track progress through a seven-step process, with an interactive mock control for demonstration purposes. The component is designed to be reusable and visually appealing, using aliceblue for incomplete steps and dodgerblue for completed steps.

Impact

• Adds new interactive UI component for step progress visualization
• Enhances user experience with visual feedback on progress
• Provides foundation for future integration with actual progress tracking functionality
• Component is self-contained and modular, minimizing potential conflicts with existing code