⚡ bolt: cache window dimensions in ParallaxLayers

[dttdrv]

💡 What: cached window.innerHeight and window.innerWidth during initialization and resize inside the ParallaxLayers object, replacing global property access within the high-frequency update() and mouseParallax() loops.
🎯 Why: accessing global window properties inside animation loops (like requestAnimationFrame or mousemove handlers) causes overhead due to cross-boundary DOM interactions. caching them locally prevents this and improves rendering performance.
📊 Impact: eliminates redundant synchronous layout property access on every frame/mouse movement, preventing potential jank on lower-end devices and improving frame rate stability.
🔬 Measurement: run the site and observe the smooth parallax transformations during scrolling and mouse movements. verify via performance tab that layout recalculations are minimized.

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PR created automatically by Jules for task 2350487595804350589 started by @dttdrv

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