ADJUST: images and underlays, -IMAGEADJUST and PDF/DWF/DGNADJUST

ADJUST gathers raster images or PDF/DWF/DGN underlays (other objects are
dropped silently, pickfirst is used, a mixed set is refused), then asks the
image option (Brightness default) or the underlay option (last used), with
value prompts that offer the image's own value or the session's last
underlay fade/contrast, and Monochrome Yes/No. Invalid values re-prompt.
One undo step. -IMAGEADJUST, PDFADJUST, DWFADJUST and DGNADJUST take one
kind each. Raster image Brightness/Contrast/Fade move to an Image Adjust
section as whole numbers with 0-100 validation.

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

src/entities/raster_image.rs

@@ -333,7 +333,20 @@ impl PropertyEditable for RasterImage {
             .contains(codec::entities::ImageDisplayFlags::USE_CLIPPING_BOUNDARY);
         let clip_inverted = self.clip_boundary.clip_mode == codec::entities::ClipMode::Inside;
         let transparency = self.common.transparency.to_string();
+        let whole = |label: &str, field: &'static str, value: u8| Property {
+            label: t!(label).into_owned(),
+            field,
+            value: PropValue::EditText(value.to_string()),
+        };
         vec![
+            PropSection {
+                title: t!("Image Adjust").into_owned(),
+                props: vec![
+                    whole("Brightness", "ri_bright", self.brightness),
+                    whole("Contrast", "ri_contrast", self.contrast),
+                    whole("Fade", "ri_fade", self.fade),
+                ],
+            },
             PropSection {
                 title: t!("Geometry").into_owned(),
                 props: vec![
@@ -362,13 +375,6 @@ impl PropertyEditable for RasterImage {
                 title: t!("Misc").into_owned(),
                 props: vec![
                     ro(t!("Name").as_ref(), "ri_name", self.file_name().to_string()),
-                    edit(
-                        t!("Brightness").as_ref(),
-                        "ri_bright",
-                        self.brightness as f64,
-                    ),
-                    edit(t!("Contrast").as_ref(), "ri_contrast", self.contrast as f64),
-                    edit(t!("Fade").as_ref(), "ri_fade", self.fade as f64),
                     ro(t!("Transparency").as_ref(), "ri_transparency", transparency),
                     Property {
                         label: t!("Show image").into_owned(),
@@ -449,9 +455,10 @@ impl PropertyEditable for RasterImage {
             "ri_ox" => self.insertion_point.x = v,
             "ri_oy" => self.insertion_point.y = v,
             "ri_oz" => self.insertion_point.z = v,
-            "ri_bright" => self.brightness = v.clamp(0.0, 100.0) as u8,
-            "ri_contrast" => self.contrast = v.clamp(0.0, 100.0) as u8,
-            "ri_fade" => self.fade = v.clamp(0.0, 100.0) as u8,
+            // Out-of-range values are refused before they get here.
+            "ri_bright" if (0.0..=100.0).contains(&v) => self.brightness = v as u8,
+            "ri_contrast" if (0.0..=100.0).contains(&v) => self.contrast = v as u8,
+            "ri_fade" if (0.0..=100.0).contains(&v) => self.fade = v as u8,
             _ => {}
         }
     }

src/entities/underlay.rs

@@ -227,7 +227,8 @@ fn parse_flag(value: &str, current: bool) -> bool {
 pub(crate) fn validate_property(field: &str, value: &str) -> Result<(), &'static str> {
     let number = || value.trim().parse::<f64>().ok();
     match field {
-        "ul_contrast" | "ul_fade" => match number() {
+        // A raster image's Image Adjust rows take the same range.
+        "ul_contrast" | "ul_fade" | "ri_bright" | "ri_contrast" | "ri_fade" => match number() {
             Some(v) if (0.0..=100.0).contains(&v) && v.fract() == 0.0 => Ok(()),
             _ => Err("Value must be an integer between 0 and 100"),
         },