v1.0.7

- Improve chaptered audio generation by outputting directly as `m4b` instead of converting from `wav`.
- Ignore chapter markers and single newlines when calculating text length, improving the accuracy of the text length calculation.
- Prevent cancellation if process is at 99%, ensuring the process is not interrupted at the last moment.
- Improved process handling for subpprocess calls, ensuring better management of subprocesses.
- Improved PDF handling, ignoring empty pages/chapters and better chapter handling.
- Added `Save in a project folder with metadata` option in the book handler, allowing users to save the converted items in a project folder with available metadata files. Useful if you want to work with the converted files in the future, issue mentioned by @Darthagnon in #15
- Added `Go to folder` button in input box, allowing users to open the folder containing the converted file.
- Added `.opus` as output format for generated audio files, which is a more efficient format for audio files.
- Added `Create desktop shortcut and install` option to Linux version, allowing users to create a shortcut and install 
- Added "Playing..." indicator for "Preview" button in the voice mixer.