feat(xref): 8-item filtered row menu, preview on selection, details display size

Row right-click menu is exactly Open, Attach..., Unload, Reload, Detach, Change Path Type group with Make Absolute, Make Relative, Remove Path, Select New Path, Find and Replace. Change Path Type renders as indented group. Open uses OCS for DWG and OS default for images and PDFs. Preview decodes on selection change, not only at refresh. Details shows placed display width and height for image instances.

locales/ru-RU/opencadstudio.ftl

@@ -3208,6 +3208,11 @@ insert =
     .xref-old-path-prefix = старый префикс пути
     .xref-attach-dwg = Attach DWG
     .xref-attach-image = Attach Image
+    .xref-attach-menu = Attach...
+    .xref-change-path-type = Change Path Type
+    .xref-find-and-replace-menu = Find and Replace...
+    .xref-display-width = Display Width
+    .xref-display-height = Display Height
     .xref-save-the-drawing-first-to-resolve-relativ = XREF Сначала сохраните чертёж, чтобы определить относительные пути внешних ссылок.
     .object-s-copied-to-clipboard-base-3-3 = В буфер обмена скопировано объектов: __ocs_fmt_0__ (базовая точка: __ocs_fmt_1__, __ocs_fmt_2__).
     .object-s-copied-to-clipboard = В буфер обмена скопировано объектов: __ocs_fmt_0__.