Lock minimum window height to the default so users cannot shrink the app vertically.

Co-authored-by: Cursor <cursoragent@cursor.com>

smart_printer/AppTheme.swift

@@ -4,7 +4,7 @@ enum AppTheme {
     static let windowWidth: CGFloat = 680
     static let windowHeight: CGFloat = 720
     static let windowMinWidth: CGFloat = 600
-    static let windowMinHeight: CGFloat = 600
+    static let windowMinHeight: CGFloat = windowHeight
 
     static let sidebarWidth: CGFloat = 200
     static let contentPadding: CGFloat = 20