IMAGEADJUST: Image Adjust dialog for raster images

IMAGEADJUST (alias IAD) takes the selected raster images or asks
"Select image(s):", then opens a dialog with a before/after preview of
the first image and brightness, contrast and fade rows (bar plus
stepper, whole numbers 0-100). Apply writes the values to every chosen
image as one undo step; restore defaults sets 50/50/0. Adds the
image_adjust automation action and the image-adjust locale group.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/modules/insert/xadjust.rs

@@ -359,5 +359,5 @@ impl CadCommand for AdjustCommand {
 }
 
 inventory::submit!(crate::command::CommandRegistration {
-    names: &["-IMAGEADJUST", "PDFADJUST", "DWFADJUST", "DGNADJUST"]
+    names: &["IMAGEADJUST", "-IMAGEADJUST", "PDFADJUST", "DWFADJUST", "DGNADJUST"]
 });