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/annotate/aligned_dim.rs

@@ -340,6 +340,7 @@ impl CadCommand for AlignedDimensionCommand {
             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,
@@ -432,6 +433,7 @@ fn preview_aligned(p1: DVec3, p2: DVec3, dim_pt: DVec3) -> 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,

src/modules/annotate/angular_dim.rs

@@ -1249,6 +1249,7 @@ fn preview_wire(points: Vec<DVec3>) -> 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,

src/modules/annotate/data_link.rs

@@ -108,6 +108,7 @@ impl DataLinkPlaceCommand {
             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/annotate/diameter_dim.rs

@@ -332,6 +332,7 @@ fn preview_line(far_chord: Vec3, chord: Vec3, text: Vec3) -> 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,

src/modules/annotate/dim_baseline.rs

@@ -729,6 +729,7 @@ fn preview_for_dimension(dimension: &Dimension) -> 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,

src/modules/annotate/jogged_radius_dim.rs

@@ -480,6 +480,7 @@ fn preview_wire(points: Vec<Vec3>) -> 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,

src/modules/annotate/leader_cmd.rs

@@ -444,6 +444,7 @@ fn preview_wire(pts: &[Vec3], arrow_size: f32) -> 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,

src/modules/annotate/linear_dim.rs

@@ -561,6 +561,7 @@ fn preview_wire(points: Vec<DVec3>) -> 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,

src/modules/annotate/mleader_cmd.rs

@@ -773,6 +773,7 @@ fn preview_wire(pts: &[Vec3], arrow_size: f32) -> 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,

src/modules/annotate/mleader_edit.rs

@@ -497,6 +497,7 @@ fn preview_wire(pts: &[Vec3]) -> 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,

src/modules/annotate/ordinate_dim.rs

@@ -289,6 +289,7 @@ fn preview_wire(points: Vec<Vec3>) -> 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,

src/modules/annotate/radius_dim.rs

@@ -350,6 +350,7 @@ fn preview_wire(points: Vec<Vec3>) -> 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,

src/modules/annotate/table_cmd.rs

@@ -315,6 +315,7 @@ impl TableCommand {
             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/annotate/tolerance_cmd.rs

@@ -88,6 +88,7 @@ impl CadCommand for ToleranceCommand {
             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,