⚡ Bolt: Optimize renderPDFs filtering with pre-calculated search index and early returns

[MrAlokTech]

💡 What:

• Added a prepareSearchIndex utility that runs during loadPDFDatabase (after caching) to attach a derived _searchStr property to every PDF object in memory.
• Refactored the filter callback inside renderPDFs to use explicit early returns (if (!condition) return false;) instead of combined boolean logic.
• Swapped the expensive, multi-field toLowerCase().includes() check with a simple substring check against the pre-calculated _searchStr.

🎯 Why:
Previously, the filtering loop executed on every keystroke. It evaluated a single return statement containing multiple boolean conditions. This forced JavaScript to evaluate all conditions (even if the first one failed) and, worst of all, execute .toLowerCase() on four different string properties for every item in the database, causing significant CPU overhead and potential main-thread blocking as the database grows.

📊 Impact:

• O(1) String Allocation in Render: Zero string allocations or .toLowerCase() conversions occur during the renderPDFs loop, drastically reducing garbage collection pressure.
• Short-circuiting: By using explicit early returns, items that fail the class or semester check are rejected instantly without executing the category or search string logic.

🔬 Measurement:

1. Open the site and load the PDFs.
2. Open the browser DevTools Performance tab and start a recording.
3. Rapidly type a 10-character search query.
4. Stop the recording. The main-thread scripting time spent inside renderPDFs will be noticeably shorter compared to the main branch, as the callback now performs a simple array membership and cached string check.

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PR created automatically by Jules for task 3987269186906865892 started by @MrAlokTech

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