Downsample used ResizeImagePolicy.exact which forced a 2048×2048
square and stretched non-square images. Switch to ResizeImagePolicy.fit
to preserve aspect ratio while still capping both dimensions.
- _imageSize reset on image switch (wrong swap threshold on nav)
- downsample caps both dims (tall images no longer full-res decode)
- single _readImageSize instead of leaking loadingBuilder listeners
- evict old downsample provider on full-res swap
- remove imageCache.clear() that dropped live image (gallery flash)
- Büyük resimler ilk yüklemede max 2048px'e downsampling (RAM ~1.6MB)
- Zoom 1.5x stretch'i geçince full-res'e swap (orijinal çözünürlük)
- Resim geçişinde eski provider evict + ImageCache.evict() (RAM leak)
- Tiled render kodu tamamen kaldırıldı
