feat: downsampling + full-res swap + RAM leak fix

- 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

CHANGELOG.md

@@ -4,6 +4,16 @@ All notable changes to imajViewer are documented in this file.
 
 ## [Unreleased]
 
+### Added
+- Downsampling: large images decode at max 2048px on first load (RAM ~1.6MB)
+- Full-res swap: zooming in past 1.5x stretch swaps to original resolution
+- Image size tracking via `loadingBuilder` for swap threshold
+
+### Fixed
+- RAM leak on image switch — old providers now evicted + `ImageCache.evict()`
+
+## [1.2.0] - 2026-08-14
+
 ### Added
 - Internationalization: Turkish + English, auto-detected from system locale
 - Zoom decodes at original resolution while zooming in (crisp details)