fix: crop save always JPEG q93 + save rotated view 1:1 (v1.4.1)

- Output extension is always .jpg regardless of source format (was: PNG in -> PNG out)
- Rotation now saved correctly: viewport grid resampled bilinearly in source
  space (was: unrotated bounding box copy)
- Quality 90 -> 93; l10n strings updated (JPEG 93)
- New: tool/crop_test.dart — pure-Dart end-to-end test (dart run tool/crop_test.dart)

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to imajViewer are documented in this file.
 
 ## [Unreleased]
 
+## [1.4.1] - 2026-10-11
+
+### Fixed
+- Crop save always writes JPEG (previously kept the source extension, e.g. PNG) — quality 93
+- Crop save with rotation now saves the rotated view 1:1 instead of an unrotated bounding box
+
 ## [1.4.0] - 2026-10-11
 
 ### Added