Frames: state-following ribbon list, DWF/DGN frames, image frame encoding and profile, frame-only picking

- The Frames list shows the drawing's frame state (hide / display and plot /
  display but not plot / frames vary), follows commands, undo and document
  switches, and lists the mixed state as a disabled item.
- DWFFRAME and DGNFRAME are frame variables of their own, kept in the header,
  and FRAME sets them with the others.
- Out-of-range frame values say "Requires an integer between 0 and 2." and
  ask again; a set value reports "Regenerating model.".
- IMAGEFRAME is stored in the image variables as bits (2 is written as 3) and
  a drawing without them uses the profile value, which setting IMAGEFRAME
  updates and the settings file keeps.
- Raster images, PDF underlays and wipeouts are picked on their frame only;
  underlay snap geometry is never picked.

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

src/modules/draw/draw/attdef.rs

@@ -206,6 +206,7 @@ impl CadCommand for AttdefCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,

src/modules/draw/draw/mline.rs

@@ -187,6 +187,7 @@ impl MlineCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: true,

src/modules/draw/draw/raster_image.rs

@@ -176,6 +176,7 @@ impl CadCommand for ImageCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,

src/modules/draw/draw/ray.rs

@@ -93,6 +93,7 @@ impl CadCommand for RayCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,
@@ -378,6 +379,7 @@ impl CadCommand for XLineCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,

src/modules/draw/inquiry/area.rs

@@ -375,6 +375,7 @@ impl CadCommand for AreaCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,

src/modules/draw/inquiry/dist.rs

@@ -95,6 +95,7 @@ impl CadCommand for DistCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,

src/modules/draw/inquiry/measuregeom.rs

@@ -77,6 +77,7 @@ impl MeasureGeomCommand {
             world_width: 0.0,
             depth_override: None,
             display_visible: true,
+            snap_only: false,
             plot_visible: true,
             fill_is_3d: false,
             fill_is_2d_solid: false,

src/modules/draw/modify/trim.rs

@@ -4151,6 +4151,7 @@ fn preview_wire(points: Vec<[f32; 3]>, color: [f32; 4], name: &str) -> WireModel
         world_width: 0.0,
         depth_override: None,
         display_visible: true,
+        snap_only: false,
         plot_visible: true,
         fill_is_3d: false,
         fill_is_2d_solid: false,