Separate HTML file into CSS, JS, and HTML files

[Copilot]

Overview

Refactored the monolithic index.html file to follow best practices for separation of concerns by extracting inline CSS and JavaScript into separate files.

Changes Made

Before

The entire application was contained in a single 207-line index.html file with:

• Inline CSS in a <style> tag (84 lines)
• Inline JavaScript in a <script> tag (108 lines)
• HTML markup mixed throughout

After

The application is now properly organized into three separate files:

1. styles.css (83 lines)

   • All CSS styling rules extracted from the inline <style> tag
   • Includes styles for layout, typography, transcription items, copy functionality, and form inputs

2. script.js (107 lines)

   • All JavaScript application logic extracted from the inline <script> tag
   • Handles message event listeners, annotation fetching, DOM manipulation, and user interactions

3. index.html (15 lines)

   • Clean HTML markup only
   • Links to external stylesheet: <link rel="stylesheet" href="styles.css">
   • References external script: <script src="script.js"></script>

Benefits

• Improved Maintainability: Each file has a single, clear responsibility
• Better Organization: Developers can quickly locate CSS, JS, or HTML code
• Enhanced Readability: Cleaner, more focused files
• Browser Caching: External CSS and JS files can be cached, improving performance
• Standards Compliance: Follows modern web development best practices
• Future Scalability: Makes it easier to add more styles or scripts as the project grows

Testing

No functionality changes were made - this is purely a structural refactoring. The application behavior remains identical to the previous version.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Separate html file into concerns (CSS/JS/HTML)</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #2

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