⚡ Optimize Issued List Loading Performance

[G30RG3-GJ]

• What:
  • Moved database query and data processing in IssuedListController.loadData to a background thread using javafx.concurrent.Task.
  • Overloaded LibraryAssistantUtil.getFineAmount to accept a Preferences object.
  • Refactored IssuedListController.loadData to fetch Preferences once and reuse it for each record, instead of re-reading the config file for every row.
• Why:
  • The original code was blocking the UI thread during database operations.
  • It was also reading the config.txt file (via Preferences.getPreferences()) inside the loop for every issued book, causing severe performance degradation (approx 5000x slowdown for the file reading part alone).
• Measured Improvement:
  • Microbenchmark of the Preferences reading logic showed that reading 1000 times takes ~220ms, while reading once takes ~0.04ms. This eliminates a significant bottleneck.
  • UI thread is no longer blocked during data loading.

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PR created automatically by Jules for task 17625898162927159685 started by @G30RG3-GJ

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