feat: window size presets — 4x8 screen-ratio grid in settings (v1.8.0)

- Settings 'Size' section: 8 col x 4 row grid, 31 buttons labeled a:b
  (a splits H, b splits W); top-left cell empty placeholder (no 1:1 —
  title bar double click already maximizes)
- Click resizes the window to work.width/b x work.height/a of the
  display's work area (screen_retriever visibleSize, taskbar excluded);
  position unchanged, no selection state tracking
- minimumSize 400x300 -> 160x100 (4:8 cell needs it)
- Settings file-properties rows left-aligned (were centered under path)

CHANGELOG.md

@@ -4,6 +4,17 @@ All notable changes to imajViewer are documented in this file.
 
 ## [Unreleased]
 
+## [1.8.0] - 2026-10-31
+
+### Added
+- Window size presets: 4×8 screen-ratio grid in settings; clicking a preset
+  resizes the window to that fraction of the screen work area (taskbar
+  excluded). Minimum window size lowered to 160×100.
+
+### Fixed
+- Settings file-properties rows were centered under the longest row (path);
+  now left-aligned.
+
 ## [1.7.2] - 2026-10-25
 
 ### Fixed