refactor: group ui/ statusbar and window subdirs

Continue tidying the flat ui/ root:

- ui/statusbar/: statusbar.rs becomes statusbar/mod.rs (its
  crate::ui::statusbar::* paths are preserved) and absorbs
  statusbar_config.rs + statusbar_menu.rs.
- ui/window/: the standalone manager/dialog windows move here —
  about, layout_manager, page_setup, plugin_manager, shortcuts,
  layers, update_notice, open_progress. The crate::ui::LayerPanel
  re-export is repointed so callers are unchanged.

Call sites repointed to the new paths; no compat re-exports beyond the
existing LayerPanel one. ui/ root drops from 21 to 10 flat files with
five subdirs (ribbon, style, popup, statusbar, window).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/mod.rs

@@ -221,7 +221,7 @@ pub(super) struct OpenCADStudio {
     /// When set, the cycling list box is open: (canvas point, candidates).
     cycle_candidates: Option<(iced::Point, Vec<acadrust::Handle>)>,
     /// Which status-bar pills the user has chosen to show (persisted).
-    statusbar_config: crate::ui::statusbar_config::StatusBarConfig,
+    statusbar_config: crate::ui::statusbar::statusbar_config::StatusBarConfig,
     /// Last persisted user preferences (DYN/OSNAP/OTRACK/POLAR/…). Compared
     /// after each message so a change is written to disk exactly once.
     last_saved_settings: Option<settings::UserSettings>,
@@ -1095,7 +1095,7 @@ pub enum Message {
     LayerToggleLock(usize),
     LayerToggleFreeze(usize),
     /// Sort the Layer Manager table by a clicked column header.
-    LayerSort(crate::ui::layers::LayerSortCol),
+    LayerSort(crate::ui::window::layers::LayerSortCol),
     /// Toggle per-viewport freeze: (layer_index, vp_col_index)
     LayerToggleVpFreeze(usize, usize),
     LayerNew,
@@ -1186,7 +1186,7 @@ pub enum Message {
     /// Close the status-bar customization menu.
     CloseStatusBarMenu,
     /// Show/hide a single status-bar pill.
-    ToggleStatusPill(crate::ui::statusbar_config::StatusPill),
+    ToggleStatusPill(crate::ui::statusbar::statusbar_config::StatusPill),
     /// Toggle clean-screen mode (hide ribbon + side panels).
     ToggleCleanScreen,
     /// Toggle whether entity transparency is shown on screen.
@@ -1763,7 +1763,7 @@ impl OpenCADStudio {
             units_popup_open: false,
             isolate_popup_open: false,
             selection_filter_popup_open: false,
-            statusbar_config: crate::ui::statusbar_config::StatusBarConfig::load(),
+            statusbar_config: crate::ui::statusbar::statusbar_config::StatusBarConfig::load(),
             last_saved_settings: None,
             otrack_active: None,
             clean_screen: false,

src/app/update/mod.rs

@@ -954,7 +954,7 @@ impl OpenCADStudio {
                         if let Some(dl) = self.tabs[i].scene.document.layers.get_mut(&name) {
                             dl.color = AcadColor::Index(aci);
                         }
-                        use crate::ui::layers::iced_color_from_acad;
+                        use crate::ui::window::layers::iced_color_from_acad;
                         let new_color = iced_color_from_acad(&AcadColor::Index(aci));
                         if let Some(pl) = self.tabs[i].layers.layers.get_mut(idx) {
                             pl.color = new_color;

src/app/view/mod.rs

@@ -1083,7 +1083,7 @@ impl OpenCADStudio {
         };
 
         let statusbar_menu_layer: Element<'_, Message> = if self.statusbar_menu_open {
-            crate::ui::statusbar_menu::statusbar_menu_overlay(&self.statusbar_config)
+            crate::ui::statusbar::statusbar_menu::statusbar_menu_overlay(&self.statusbar_config)
         } else {
             iced::widget::Space::new().width(0).height(0).into()
         };
@@ -1141,7 +1141,7 @@ impl OpenCADStudio {
         };
 
         let open_progress_layer: Element<'_, Message> = if let Some(p) = &self.opening {
-            crate::ui::open_progress::view(p, iced::time::Instant::now())
+            crate::ui::window::open_progress::view(p, iced::time::Instant::now())
         } else {
             iced::widget::Space::new().width(0).height(0).into()
         };

src/app/view/modal.rs

@@ -17,16 +17,16 @@ impl OpenCADStudio {
                 .into()
         }
         Some(match self.active_modal? {
-            super::super::ModalKind::About => crate::ui::about::view_window(),
+            super::super::ModalKind::About => crate::ui::window::about::view_window(),
             super::super::ModalKind::Shortcuts => {
-                sized(crate::ui::shortcuts::view_window(&self.shortcut_overrides), 720, 520)
+                sized(crate::ui::window::shortcuts::view_window(&self.shortcut_overrides), 720, 520)
             }
             super::super::ModalKind::PluginManager => sized(
-                crate::ui::plugin_manager::view_window(
+                crate::ui::window::plugin_manager::view_window(
                     &self.disabled_plugins,
                     &self.external_plugins,
                     &self.loaded_plugin_ids,
-                    crate::ui::plugin_manager::MarketView {
+                    crate::ui::window::plugin_manager::MarketView {
                         registry: &self.plugin_registry,
                         input: &self.plugin_repo_input,
                         repos: &self.plugin_repos,
@@ -41,14 +41,14 @@ impl OpenCADStudio {
             super::super::ModalKind::UpdateNotice => {
                 let latest = self.update_notice_version.as_deref().unwrap_or("?");
                 let body = self.update_notice_body.as_deref().unwrap_or("");
-                sized(crate::ui::update_notice::view_window(latest, body), 560, 460)
+                sized(crate::ui::window::update_notice::view_window(latest, body), 560, 460)
             }
             super::super::ModalKind::Layers => {
                 let tab = &self.tabs[self.active_tab];
                 sized(tab.layers.view_window(), 900, 360)
             }
             super::super::ModalKind::PageSetup => sized(
-                crate::ui::page_setup::view_window(
+                crate::ui::window::page_setup::view_window(
                     &self.page_setup_w,
                     &self.page_setup_h,
                     &self.page_setup_plot_area,
@@ -66,7 +66,7 @@ impl OpenCADStudio {
                 let layouts = self.tabs[i].scene.layout_names();
                 let current = self.tabs[i].scene.current_layout.clone();
                 sized(
-                    crate::ui::layout_manager::view_window(
+                    crate::ui::window::layout_manager::view_window(
                         layouts,
                         &self.layout_manager_selected,
                         &self.layout_manager_rename_buf,

src/ui/mod.rs

@@ -2,33 +2,24 @@
 /// Change this to scale the ribbon, layer manager rows, and property panel rows uniformly.
 pub const ROW_H: f32 = 26.0;
 
-pub mod about;
 pub mod app_menu;
 pub mod color_select;
 pub mod command_line;
 pub mod icons;
-pub mod layers;
-pub mod layout_manager;
 pub mod modal;
-pub mod open_progress;
 pub mod overlay;
-pub mod page_setup;
-pub mod plugin_manager;
 pub mod popup;
 pub mod properties;
 pub mod ribbon;
 pub mod side_toolbar;
-pub mod shortcuts;
 pub mod statusbar;
-pub mod statusbar_config;
-pub mod statusbar_menu;
 pub mod style;
 pub mod text_util;
-pub mod update_notice;
+pub mod window;
 
 pub use app_menu::AppMenu;
 pub use command_line::CommandLine;
-pub use layers::LayerPanel;
 pub use properties::PropertiesPanel;
 pub use ribbon::Ribbon;
 pub use statusbar::StatusBar;
+pub use window::layers::LayerPanel;

src/ui/statusbar/mod.rs

@@ -1,5 +1,8 @@
 //! Bottom status bar — Model/Layout tabs + OSNAP toggle + status info
 
+pub mod statusbar_config;
+pub mod statusbar_menu;
+
 use iced::widget::tooltip::Position as TipPos;
 use iced::widget::{button, column, container, mouse_area, row, text, text_input, tooltip, Row};
 use iced::{Background, Border, Color, Element, Length, Theme};
@@ -10,7 +13,7 @@ pub const LAYOUT_RENAME_INPUT_ID: &str = "layout_rename_input";
 
 use crate::app::Message;
 use crate::snap::Snapper;
-use crate::ui::statusbar_config::{StatusBarConfig, StatusPill};
+use crate::ui::statusbar::statusbar_config::{StatusBarConfig, StatusPill};
 
 #[derive(Clone, Default)]
 pub struct StatusBar {

src/ui/statusbar/statusbar_menu.rs

@@ -6,7 +6,7 @@ use iced::widget::{button, column, container, mouse_area, row, text};
 use iced::{Background, Border, Color, Element, Fill, Length, Padding, Theme};
 
 use crate::app::Message;
-use crate::ui::statusbar_config::{StatusBarConfig, StatusPill};
+use crate::ui::statusbar::statusbar_config::{StatusBarConfig, StatusPill};
 
 /// Full-screen overlay: transparent click-catcher + the menu panel pinned to
 /// the bottom-right, just above the status bar.

src/ui/window/mod.rs

@@ -0,0 +1,8 @@
+pub mod about;
+pub mod layout_manager;
+pub mod page_setup;
+pub mod plugin_manager;
+pub mod shortcuts;
+pub mod layers;
+pub mod update_notice;
+pub mod open_progress;