refactor: group ui/ style+popup dirs, rename cmd_result driver

- Group the flat src/ui/ dir: move the 9 style editors into ui/style/
  (dimstyle, mleaderstyle, mlstyle, plotstyle, textstyle, tablestyle,
  point_style, style_list, style_manager) and the 6 popups into
  ui/popup/ (cycle, isolate, scale, selection_filter, snap, units).
  Call sites repointed to crate::ui::style::/crate::ui::popup::; no
  compat re-exports. ui/ root drops from 36 to 21 files.
- Rename app/cmd_result.rs -> app/command_driver.rs: the file is the
  StepInput->feed_command driver, not the CmdResult type (which lives
  in command.rs). Name now matches contents.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/app/mod.rs

@@ -2,7 +2,7 @@
 mod automation;
 #[cfg(not(target_arch = "wasm32"))]
 pub use automation::{export_headless, serve};
-mod cmd_result;
+mod command_driver;
 mod commands;
 mod document;
 mod expr_eval;

src/app/update/mod.rs

@@ -2703,7 +2703,7 @@ impl OpenCADStudio {
                 self.style_rename_start(kind, name);
                 // Focus the freshly-shown rename field so the user can type
                 // immediately after the double click.
-                iced::widget::operation::focus(crate::ui::style_list::rename_input_id())
+                iced::widget::operation::focus(crate::ui::style::style_list::rename_input_id())
             }
             Message::StyleRenameEdit(s) => {
                 self.style_rename_buf = s;

src/app/view/mod.rs

@@ -883,7 +883,7 @@ impl OpenCADStudio {
                     .collect();
                 if !items.is_empty() {
                     viewport_stack = viewport_stack
-                        .push(crate::ui::cycle_popup::cycle_popup_overlay(*pt, items));
+                        .push(crate::ui::popup::cycle_popup::cycle_popup_overlay(*pt, items));
                 }
             }
         }
@@ -1065,14 +1065,14 @@ impl OpenCADStudio {
         .height(Fill);
 
         let snap_layer: Element<'_, Message> = if self.snap_popup_open {
-            crate::ui::snap_popup::snap_popup_overlay(&self.snapper, 4.0)
+            crate::ui::popup::snap_popup::snap_popup_overlay(&self.snapper, 4.0)
         } else {
             iced::widget::Space::new().width(0).height(0).into()
         };
 
         let scale_layer: Element<'_, Message> = if self.scale_popup_open {
             let is_model = tab.scene.current_layout == "Model";
-            crate::ui::scale_popup::scale_popup_overlay(
+            crate::ui::popup::scale_popup::scale_popup_overlay(
                 is_model,
                 tab.scene.annotation_scale,
                 tab.scene.first_viewport_scale(),
@@ -1089,13 +1089,13 @@ impl OpenCADStudio {
         };
 
         let units_layer: Element<'_, Message> = if self.units_popup_open {
-            crate::ui::units_popup::units_popup_overlay(tab.scene.document.header.insertion_units)
+            crate::ui::popup::units_popup::units_popup_overlay(tab.scene.document.header.insertion_units)
         } else {
             iced::widget::Space::new().width(0).height(0).into()
         };
 
         let isolate_layer: Element<'_, Message> = if self.isolate_popup_open {
-            crate::ui::isolate_popup::isolate_popup_overlay(
+            crate::ui::popup::isolate_popup::isolate_popup_overlay(
                 !tab.scene.selected.is_empty(),
                 tab.scene.is_isolation_active(),
             )
@@ -1110,7 +1110,7 @@ impl OpenCADStudio {
                 .into_iter()
                 .map(|s| s.to_string())
                 .collect();
-            crate::ui::selection_filter_popup::selection_filter_popup_overlay(
+            crate::ui::popup::selection_filter_popup::selection_filter_popup_overlay(
                 types,
                 &tab.scene.selection_filter,
             )

src/app/view/modal.rs

@@ -77,7 +77,7 @@ impl OpenCADStudio {
                 )
             }
             super::super::ModalKind::Plotstyle => sized(
-                crate::ui::plotstyle::view_window(
+                crate::ui::style::plotstyle::view_window(
                     self.active_plot_style.as_ref(),
                     self.plotstyle_panel_aci,
                     &self.ps_color_buf,
@@ -104,7 +104,7 @@ impl OpenCADStudio {
                     .map(|s| (s.flags.backward, s.flags.upside_down, s.annotative))
                     .unwrap_or((false, false, false));
                 sized(
-                    crate::ui::textstyle::view_window(crate::ui::textstyle::TextStyleView {
+                    crate::ui::style::textstyle::view_window(crate::ui::style::textstyle::TextStyleView {
                         styles,
                         selected: &self.textstyle_selected,
                         current: &tab.scene.document.header.current_text_style_name,
@@ -144,7 +144,7 @@ impl OpenCADStudio {
                     _ => None,
                 });
                 sized(
-                    crate::ui::mlstyle::view_window(
+                    crate::ui::style::mlstyle::view_window(
                         styles,
                         &self.mlstyle_selected,
                         selected_style,
@@ -174,7 +174,7 @@ impl OpenCADStudio {
                     _ => None,
                 });
                 sized(
-                    crate::ui::tablestyle::view_window(
+                    crate::ui::style::tablestyle::view_window(
                         styles,
                         &self.tablestyle_selected,
                         &self.ribbon.active_table_style,
@@ -270,7 +270,7 @@ impl OpenCADStudio {
                         None => Default::default(),
                     };
                 sized(
-                    crate::ui::mleaderstyle::view_window(crate::ui::mleaderstyle::MLeaderStyleView {
+                    crate::ui::style::mleaderstyle::view_window(crate::ui::style::mleaderstyle::MLeaderStyleView {
                         styles,
                         selected: &self.mleaderstyle_selected,
                         style: selected_style,
@@ -370,7 +370,7 @@ impl OpenCADStudio {
                 ),
                 None => Default::default(),
             };
-            sized(crate::ui::dimstyle::view_window(
+            sized(crate::ui::style::dimstyle::view_window(
                 styles,
                 &self.dimstyle_selected,
                 &self.tabs[self.active_tab]
@@ -379,7 +379,7 @@ impl OpenCADStudio {
                     .header
                     .current_dimstyle_name,
                 self.dimstyle_tab,
-                crate::ui::dimstyle::DimStyleValues {
+                crate::ui::style::dimstyle::DimStyleValues {
                     dimdle: &self.ds_dimdle,
                     dimdli: &self.ds_dimdli,
                     dimgap: &self.ds_dimgap,
@@ -484,7 +484,7 @@ impl OpenCADStudio {
                 sized(unsaved_changes_dialog_window(&tab_name), 420, 160)
             }
             super::super::ModalKind::PointStyle => sized(
-                crate::ui::point_style::view_window(
+                crate::ui::style::point_style::view_window(
                     self.tabs[self.active_tab].scene.document.header.point_display_mode,
                     self.point_size_relative,
                     &self.point_size_buf,