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

Cargo.lock

@@ -2571,8 +2571,6 @@ dependencies = [
  "iced_core",
  "iced_fonts_macros",
  "iced_widget",
- "num-format",
- "num-traits",
  "web-time",
 ]
 
@@ -3770,16 +3768,6 @@ dependencies = [
  "syn 2.0.119",
 ]
 
-[[package]]
-name = "num-format"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a652d9771a63711fd3c3deb670acfbe5c30a4072e664d7a3bf5a9e1056ac72c3"
-dependencies = [
- "arrayvec",
- "itoa",
-]
-
 [[package]]
 name = "num-integer"
 version = "0.1.46"