- Create PlatformImage expect/actual abstracting Bitmap/BufferedImage
- Move pure blurhash algorithms (Base83, SRGB, CosineCache, BlurHashEncoder) to commonMain
- Rewrite BlurHashDecoder to return PlatformImage instead of Bitmap
- Add PlatformImage.toBlurhash() extension in commonMain
- Add platform-specific Bitmap.toBlurhash() and BufferedImage.toBlurhash()
- Add base64Image toPlatformImage() for both Android and JVM
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>