• Upgraded Abogen's interface from PyQt5 to PyQt6 for better compatibility and long-term support.
• Added tooltip indicators in queue manager to display book handler options (Save chapters separately and Merge chapters at the end) for queued items.
• Added Open processed file and Open input file options for items in the queue manager, instead of just Open file option.
• Added loading gif animation to book handler window.
• Fixed light theme slider colors in voice mixer for better visibility (for non-Windows users).
• Fixed subtitle word-count splitting logic for more accurate segmentation.
• Improvements in code and documentation.