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/app/command_driver/utilities.rs

@@ -507,6 +507,32 @@ impl OpenCADStudio {
         StepInput::SelectionComplete(kept)
     }
 
+    /// Keeps only the kinds of object the active command takes, dropping
+    /// the rest of a completed selection silently.
+    fn filter_command_entity_selection(&mut self, input: StepInput) -> StepInput {
+        let StepInput::SelectionComplete(handles) = input else {
+            return input;
+        };
+        let i = self.active_tab;
+        let Some(keep) = self.tabs[i]
+            .active_cmd
+            .as_ref()
+            .and_then(|command| command.selection_entity_filter())
+        else {
+            return StepInput::SelectionComplete(handles);
+        };
+        let (kept, dropped): (Vec<Handle>, Vec<Handle>) = handles
+            .into_iter()
+            .partition(|h| self.tabs[i].scene.document.get_entity(*h).is_some_and(keep));
+        for handle in &dropped {
+            self.tabs[i].scene.deselect_entity(*handle);
+        }
+        if !dropped.is_empty() {
+            self.refresh_properties();
+        }
+        StepInput::SelectionComplete(kept)
+    }
+
     /// Drops locked point clouds from a completed selection when the active
     /// command would move them, saying which were locked and how many went.
     fn filter_locked_point_cloud_selection(&mut self, input: StepInput) -> StepInput {
@@ -562,6 +588,7 @@ impl OpenCADStudio {
         let input = self.filter_associative_dimension_selection(input);
         let input = self.filter_block_reference_selection(input);
         let input = self.filter_locked_point_cloud_selection(input);
+        let input = self.filter_command_entity_selection(input);
         // XCLIP / CLIP learn which chosen references carry a clip already.
         {
             let i = self.active_tab;