A new feature and some enhancements: Resize Options, Worker Pool, and Progress Tracking

[mmshooreshi]

feat: add resize options, worker-based async processing & processing intensity control

• Introduced a new Resize Options component for easy toggling and preset selection, with an aspect ratio lock for responsive width/height updates.
• Moved CPU-heavy tasks (decoding, resizing, encoding) into web workers and enabled a worker pool for maximum intensity (level 4) processing, ensuring the UI stays snappy.
• Implemented a Processing Intensity slider to let users choose from 1 (very light) to 4 (max aggressive) processing, with granular async progress reporting including elapsed time.
• These changes improve performance and give users better control over image processing quality and speed.

Thanks for considering my changes – hope it helps make Squish even more awesome!

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