⚡ Bolt: Optimize consoleFeed updates with IntersectionObserver

[kaitoartz]

💡 What: Added an IntersectionObserver to track the visibility of the consoleFeed element and prevent the setInterval callback from creating and appending DOM elements when the user is scrolled away from it.

🎯 Why: The consoleFeed was running a setInterval every 3 seconds that created a new div, prepended it to the DOM, and checked the child count. This caused unnecessary CPU usage, forced layout recalculations, and increased garbage collection pressure even when the element wasn't on screen.

📊 Impact: Zero execution overhead and DOM manipulation for the decorative console feed when off-screen.

🔬 Measurement: Profile the page while scrolled to the top. The setInterval callback in script.js will no longer cause DOM mutation events or trigger layout rendering.

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PR created automatically by Jules for task 12882438477863308627 started by @kaitoartz

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