⚡ Bolt: [performance improvement] Precalculate Derived Render Properties

[MrAlokTech]

💡 What: Added a prepareSearchIndex function that executes once after loading the PDF database. It appends pre-calculated derived properties (_searchStr, _isNew, _formattedDate) directly to the objects in the array. Refactored the renderPDFs filter loop to use these pre-computed properties instead of computing them dynamically on every keystroke, and optimized the conditions with early returns.

🎯 Why: The application features a live search capability that runs renderPDFs on every input keypress (debounced, but still frequent). Doing .toLowerCase() on multiple string fields, generating regexes, instantiating new Date objects, and formatting them for every document dynamically during every render iteration is highly inefficient. Moving these calculations upstream to the initialization/caching phase prevents redundant computations.

📊 Impact: Massively reduces string allocations and Date object instantions during live search and filter operations, resulting in lower CPU overhead and smoother keystrokes, particularly on slower mobile devices as the database scales.

🔬 Measurement:
Before: 1000 items would trigger 4000 .toLowerCase() string allocations, 1000 Date() instantiations, and 1000 string concatenations on every single render cycle.
After: 1000 items trigger 1000 .includes() string lookups on a single precomputed string per item. Date formatting and calculations happen 0 times per render cycle. Visual parity was verified.

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PR created automatically by Jules for task 13079143746385038976 started by @MrAlokTech

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