feat(entities): surface remaining 2D + Region fields in properties

Closes out the 2D-entity audit (and the Region partner that ships next
to Solid3D / Body). Round-trip-only metadata fields plus a few editable
ones gain Properties-panel rows so the values the parser populates are
visible and don't get silently dropped on save:

- Hatch: seed_points count, pixel_size, normal
- Polyline2D: smooth_surface, default_start_width, default_end_width,
  thickness, normal (with editors for the widths/thickness)
- Region: uid, silhouettes (shared file with Solid3D / Body)
- Underlay: clip_inverted
- RasterImage: class_version, definition_handle, definition_reactor_handle
- Wipeout: class_version, clip_mode, definition_handle,
  definition_reactor_handle
- Leader: annotation_handle, override_color
- Tolerance: dimension_style_name, dimension_style_handle, dimension_gap,
  text_height (editable), direction, normal
- MLine: style_handle, style_element_count, justification picker
- Ole2Frame: version, source_application, binary_data size, dwg_mode,
  dwg_trailing_byte, is_paper_space
- Viewport: snap_base/spacing/angle, twist_angle, front/back clip Z,
  circle_sides, grid_flags, grid_major, base_ucs_handle, ucs_ortho_type,
  background_handle, shade_plot_handle, visual_style_handle,
  default_lighting, default_lighting_type, ambient_color (with editors
  for the snap / clip / circle_sides values)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/entities/tolerance.rs

@@ -290,6 +290,41 @@ impl PropertyEditable for Tolerance {
                 edit("Insert X", "tol_ix", self.insertion_point.x),
                 edit("Insert Y", "tol_iy", self.insertion_point.y),
                 edit("Insert Z", "tol_iz", self.insertion_point.z),
+                ro(
+                    "Dim Style",
+                    "tol_dim_style",
+                    if self.dimension_style_name.is_empty() {
+                        "(default)".to_string()
+                    } else {
+                        self.dimension_style_name.clone()
+                    },
+                ),
+                ro(
+                    "Dim Style Handle",
+                    "tol_dim_style_handle",
+                    match self.dimension_style_handle {
+                        Some(h) if !h.is_null() => format!("{:X}", h.value()),
+                        _ => "(none)".to_string(),
+                    },
+                ),
+                edit("Text Height", "tol_text_height", self.text_height),
+                edit("Dim Gap", "tol_dim_gap", self.dimension_gap),
+                ro(
+                    "Direction",
+                    "tol_direction",
+                    format!(
+                        "{:.3}, {:.3}, {:.3}",
+                        self.direction.x, self.direction.y, self.direction.z
+                    ),
+                ),
+                ro(
+                    "Normal",
+                    "tol_normal",
+                    format!(
+                        "{:.3}, {:.3}, {:.3}",
+                        self.normal.x, self.normal.y, self.normal.z
+                    ),
+                ),
             ],
         }
     }
@@ -302,6 +337,8 @@ impl PropertyEditable for Tolerance {
             "tol_ix" => self.insertion_point.x = v,
             "tol_iy" => self.insertion_point.y = v,
             "tol_iz" => self.insertion_point.z = v,
+            "tol_text_height" if v > 0.0 => self.text_height = v,
+            "tol_dim_gap" => self.dimension_gap = v,
             _ => {}
         }
     }