Sheet sets: fields evaluated when a sheet opens; VIEW WINDOW

- A drawing's sheet set fields are refreshed when it opens with sets loaded.
- VIEW WINDOW <name> <x1,y1> <x2,y2> saves the plan view of a window.
- opencadcodec: block-attribute fields use their block reference's layout.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

locales/ru-RU/opencadstudio.ftl

@@ -3262,6 +3262,7 @@ layers =
     .usage-view-list-view-save-name-view-restore-na = Использование: VIEW LIST | VIEW SAVE <name> | VIEW RESTORE <name> | VIEW DELETE <name>
     .usage-view-restore-name = Использование: VIEW RESTORE <name>
     .usage-view-save-name = Использование: VIEW SAVE <name>
+    .usage-view-window = Usage: VIEW WINDOW <name> <x1,y1> <x2,y2>
     .usage-prefix-font-style-font-file = Использование: __ocs_fmt_0__ FONT <style> <font_file>
     .usage-prefix-list-new-name-font-style-file-wid = Использование: __ocs_fmt_0__ LIST | NEW <name> | FONT <style> <file> | WIDTH <style> <factor> | OBLIQUE <style> <angle>
     .usage-prefix-new-name = Использование: __ocs_fmt_0__ NEW <name>