v1.0.8

# v1.0.8
- Added support for AMD GPUs in Linux (Special thanks to @hg000125 for his contribution in #23)
- Added voice preview caching system that stores generated previews in the cache folder, mentioned by @jborza in #22
- Added extra metadata support for chaptered M4B files, ensuring better compatibility with audiobook players.
- Added new option: `Separate chapters audio format`, allowing to choose between `wav`, `mp4`, `flac` and `opus` formats for chaptered audio files.
- Added a download tracker that displays informative messages while downloading Kokoro models or voices from HuggingFace.
- Skipping PyTorch CUDA installation if GPU is not NVIDIA in WINDOWS_INSTALL.bat script, preventing unnecessary installation of PyTorch.
- Removed `abogen_` prefix that was adding to converted books in temp directory.
- Fixed voice preview player keeps playing silently at the background after preview ends.
- Fixed not writing separate chapters audio when output is OPUS.
- Improved input box background color handling, fixed display issues in Linux.
- Updated profile and voice mixer icons, better visibility and aesthetics in voice mixer.
- Better sleep state handling for Linux.
- Improvements in documentation and code.