⚡ Bolt: Cache favorites to avoid redundant JSON parsing

[MrAlokTech]

💡 What: Added favoritesCache global variable to store the parsed list of favorited PDFs. Updated getFavorites() to return the cache and toggleFavorite() to update it, avoiding redundant calls to localStorage.getItem and JSON.parse during loop rendering.

🎯 Why: During list rendering loops in renderPDFs, the createPDFCard logic frequently called getFavorites(), causing redundant, synchronous execution of localStorage.getItem and JSON.parse. This change moves this check to a lightweight in-memory cache variable, speeding up rendering of large arrays.

📊 Impact: Reduces repetitive synchronous disk reads and JSON parsing overhead from O(N) where N is number of PDF cards shown, to O(1) single parse per user session.

🔬 Measurement: Local tests via python script verify.py validated that the caching variable reliably intercepted standard localStorage requests and smoothly handled toggles.

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PR created automatically by Jules for task 7284458044759726191 started by @MrAlokTech

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