Block Definition dialog: preview, empty-block band, open in editor

The name card draws the selected objects, or the existing definition the
name picks. OK with no objects shows an in-window band offering to select
objects or to define an empty block. A switch opens the new block in the
block editor once it is defined; it is remembered with the other dialog
choices. Automation gains block_def_dialog.

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

locales/ru-RU/opencadstudio.ftl

@@ -6598,3 +6598,9 @@ ucs-follow =
     .prompt = UCSFOLLOW: enter 0 (keep view) or 1 (follow UCS) <__ocs_fmt_0__>:
     .paper-space = UCSFOLLOW: activate a model viewport; paper space cannot follow the UCS.
     .invalid = UCSFOLLOW: only 0 or 1 is allowed.
+
+block-def-dialog =
+    .open-in-editor = Open in block editor after creating
+    .remembered = Specify On-screen, the object option, Allow exploding and this switch are remembered for the next time.
+    .no-objects = No objects are selected for the block.
+    .create-empty = Create empty block