fix: open-issue sweep — drawing, plot, snap, layout and UI fixes

Fixes:
- Font prompt no longer lists bundled ltypeshp/qcadshp shape files (#1626)
- Wide polylines step at a discontinuous segment width; PEDIT marks the
  current vertex; keyword steps refresh the command preview (#1628)
- Radius-0 fillet drops the zero-length segment it left, so the corner
  fillets again (#1422)
- FILLET Trim / No trim option (#1558)
- True-colour wires plot in their own colour; colour picker stores the
  value it shows (#1621)
- Model tab keeps its page setup; "Save changes to layout" in Model (#1620)
- QNEW default template in Options > Files; .dwt in the open dialog
  (#1134, #1113)
- GRIDUNIT / GRIDMODE / PERSPECTIVE variables (#1618, #1524)
- PTYPE (#1433)
- ZOOM nX / nXP (#1465)
- CHSPACE between model and paper space through a viewport (#1428)
- Moving a dimension keeps its automatic text placement
- Shell icon; "&&" button labels (#1554)
- LINETYPE Load from a .lin file (#1588)
- XLINE / RAY hide the crosshair arms (#1437)
- Dynamic-input boxes keep clear of the crosshair and each other (#1546)
- Snap marker colour setting, dark default on light canvases
  (#1497, #1229, #1128)
- Dimension style precision as a 0.00 pattern dropdown (#1426)
- Node graph nodes left of the origin no longer clip away (#1592)
- Collapse button in the command history header (#1094)
- Freeze-in-current-viewport toggle in the ribbon layer list (#1466)
- Geometric Center object snap for closed polylines (#1369)

New strings translated in all 21 locales.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/window/alias_editor.rs

@@ -218,7 +218,7 @@ pub fn view_window<'a>(
         .on_press(Message::AliasEditorApply)
         .padding([4, 16])
         .style(button::primary);
-    let apply_exit = button(text(t!("Apply && Exit")).size(12))
+    let apply_exit = button(text(t!("Apply & Exit")).size(12))
         .on_press(Message::AliasEditorApplyExit)
         .padding([4, 16])
         .style(button::primary);
@@ -307,7 +307,7 @@ pub fn view_window<'a>(
             text(t!("Unsaved changes will be discarded.")).size(14),
             Space::new().height(10),
             row![
-                button(text(t!("Discard && close")).size(12))
+                button(text(t!("Discard & close")).size(12))
                     .on_press(Message::AliasEditorCloseDiscard)
                     .padding([4, 12])
                     .style(button::danger),

src/ui/window/options.rs

@@ -209,11 +209,14 @@ pub fn view_window<'a>(
     zoom_factor_input: &'a str,
     drawing_prefs: DrawingPrefs,
     folders: Folders,
+    qnew_template: &'a str,
     double_click_block_refedit: bool,
     double_click_block_attedit: bool,
     cursor_type: CursorType,
     crosshair_color: Option<[u8; 3]>,
     crosshair_color_input: &'a str,
+    snap_marker_color: Option<[u8; 3]>,
+    snap_marker_color_input: &'a str,
     lineweight_display_scale: i32,
     model_space: &'a crate::app::config::ModelSpaceThemeConfig,
     model_bg_input: &'a str,
@@ -522,6 +525,24 @@ pub fn view_window<'a>(
             ..Default::default()
         });
 
+    let snap_rgb = snap_marker_color.unwrap_or([255, 230, 26]);
+    let snap_swatch = container(Space::new())
+        .width(28)
+        .height(22)
+        .style(move |theme: &Theme| container::Style {
+            background: Some(Background::Color(iced::Color::from_rgb8(
+                snap_rgb[0],
+                snap_rgb[1],
+                snap_rgb[2],
+            ))),
+            border: Border {
+                color: theme.palette().background.strong.color,
+                width: 1.0,
+                radius: 3.0.into(),
+            },
+            ..Default::default()
+        });
+
     let model_bg_rgb = model_space.custom_bg.unwrap_or(crate::app::config::CLASSIC_CAD_DARK_BG);
 
     let paper_bg_rgb = model_space.custom_paper_bg.unwrap_or(crate::app::config::DEFAULT_PAPER_BG);
@@ -769,6 +790,18 @@ pub fn view_window<'a>(
             .spacing(10)
             .align_y(iced::Center),
         )
+        .push(Space::new().height(10))
+        .push(
+            row![
+                text(crate::t!("Snap marker color")).size(12).width(140),
+                snap_swatch,
+                text_input(crate::t!("#RRGGBB or blank").as_ref(), snap_marker_color_input)
+                    .on_input(Message::SnapMarkerColorChanged)
+                    .width(150),
+            ]
+            .spacing(10)
+            .align_y(iced::Center),
+        )
         .push(Space::new().height(6))
         .push(
             text(crate::t!("Leave the color blank to keep automatic viewport contrast."))
@@ -1666,6 +1699,21 @@ pub fn view_window<'a>(
         folder_row(crate::t!("Plugins"), folders.plugins.clone()),
         Space::new().height(12),
         folder_row(crate::t!("Autosave files"), folders.autosave.clone()),
+        Space::new().height(16),
+        text(crate::t!("Default template for new drawings")).size(12),
+        Space::new().height(4),
+        row![
+            text_input(crate::t!("Blank drawing").as_ref(), qnew_template)
+                .on_input(Message::QnewTemplateChanged)
+                .size(11)
+                .width(Fill),
+            button(text(crate::t!("Browse...")).size(11))
+                .padding([4, 10])
+                .style(button::secondary)
+                .on_press(Message::QnewTemplateBrowse),
+        ]
+        .spacing(10)
+        .align_y(iced::Center),
     ]
     .spacing(0)
     .width(sizing.width);

src/ui/window/plot.rs

@@ -1553,7 +1553,7 @@ pub fn view_window(
                 paper_space_option(s.paperspace_last, t!("Paper space last"), PlotFlag::PaperspaceLast),
                 check(t!("Merge overlapping lines"), s.merge_lines, PlotFlag::MergeLines),
                 check(t!("Plot stamp"), s.stamp, PlotFlag::Stamp),
-                paper_space_option(s.save_to_layout, t!("Save changes to layout"), PlotFlag::SaveToLayout),
+                check(t!("Save changes to layout"), s.save_to_layout, PlotFlag::SaveToLayout),
             ]
             .spacing(6)
             .width(width),

src/ui/window/shortcuts.rs

@@ -241,7 +241,7 @@ pub fn view_window<'a>(
         .on_press(Message::ShortcutEditorApply)
         .padding([4, 16])
         .style(button::primary);
-    let apply_exit = button(text(t!("Apply && Exit")).size(12))
+    let apply_exit = button(text(t!("Apply & Exit")).size(12))
         .on_press(Message::ShortcutEditorApplyExit)
         .padding([4, 16])
         .style(button::primary);
@@ -330,7 +330,7 @@ pub fn view_window<'a>(
             text(t!("Unsaved changes will be discarded.")).size(14),
             Space::new().height(10),
             row![
-                button(text(t!("Discard && close")).size(12))
+                button(text(t!("Discard & close")).size(12))
                     .on_press(Message::ShortcutEditorCloseDiscard)
                     .padding([4, 12])
                     .style(button::danger),