Graphic Attributes: quieter swatches, Enter in linetype scale, undo names

- Colour swatches carry no *VARIES* or ByBlock text; the L / B / C / V
  button already shows that.
- A separator sits between "Create Layer with active settings" and the
  "Create fills on the current layer" checkbox.
- The linetype scale field is a plain text field like the Properties
  panel: the first click selects its value, Enter applies it (decimal
  comma and expressions accepted) instead of repeating the last command.
  This drops the iced_aw number_input feature again.
- Undo/redo name fill changes "Fill change" and linetype changes
  "Linetype", in all 21 locales.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VgkJN8DEojuPTumAXLHotu

locales/ru-RU/opencadstudio.ftl

@@ -5641,7 +5641,7 @@ graphic-attributes =
     .one-unsupported = Графические атрибуты: 1 неподдерживаемый объект не изменён.
     .unsupported-skipped = Графические атрибуты: неподдерживаемые объекты (__ocs_fmt_0__) не изменены.
     .fill-transparency = Прозрачность заливки
-    .line-linetype = Тип линий
+    .fill-change = Изменение заливки
     .line-transparency = Прозрачность линий
     .cylindrical-short = Цил.
     .spherical-short = Сфер.