fix: image_canvas correctness + RAM fixes (v1.3.0)

- _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)

CHANGELOG.md

@@ -4,22 +4,26 @@ 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
+## [1.3.0] - 2026-08-14
 
 ### Fixed
-- RAM leak on image switch — old providers now evicted + `ImageCache.evict()`
+- `_imageSize` now resets on image switch (wrong swap threshold on navigation)
+- Downsample now caps both dimensions, not just width (tall images no longer full-res decode)
+- Image size listener leak in `loadingBuilder` — replaced with single `_readImageSize`
+- Old downsample provider now evicted on full-res swap
+- Removed `imageCache.clear()` that also dropped the live image (gallery flash)
 
 ## [1.2.0] - 2026-08-14
 
 ### 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
 - Internationalization: Turkish + English, auto-detected from system locale
 - Zoom decodes at original resolution while zooming in (crisp details)
 - Max zoom increased to 20x
 
 ### Fixed
+- RAM leak on image switch — old providers now evicted + `ImageCache.evict()`
 - Black screen flash during zoom (gapless playback)
 
 ### Changed