[WIP] Update index.php to implement panel-based design

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Update index.php to implement a modern panel-based design using the classes from style.css. Replace custom compact classes with standard panel, card, stats-grid, stat-box, overview-grid, overview-item, and other relevant classes from style.css. Ensure the design is responsive and uses the dark theme. Maintain all PHP functionality.

This pull request was created as a result of the following prompt from Copilot chat.

Update index.php to implement a modern panel-based design using the classes from style.css. Replace custom compact classes with standard panel, card, stats-grid, stat-box, overview-grid, overview-item, and other relevant classes from style.css. Ensure the design is responsive and uses the dark theme. Maintain all PHP functionality.

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