feat(styles): green ✓ for current style + resolve it from DWG files

- The current-style marker is now a green ✓ in its own fixed-width column
  so names stay aligned; rendered as a separate coloured glyph rather than
  baked into the label string.
- Resolve the current text / dimension / multiline style from the handle
  the DWG header stores into the name the app reads (fix_current_style_names
  on load). DXF already provides these as names ($TEXTSTYLE / $DIMSTYLE /
  $CMLSTYLE); DWG only stores handles, so the marker previously always fell
  back to "Standard". Only overrides when the handle resolves.

Note: table and multileader current styles are not surfaced by the file
reader (no header name/handle exposed), so those markers still default to
the app's active selection until acadrust exposes them.

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

src/io/mod.rs

@@ -99,6 +99,7 @@ pub fn load_file(path: &Path) -> Result<CadDocument, String> {
                 .read()
                 .map_err(|e| e.to_string())?;
             fix_viewport_status_flags(&mut doc);
+            fix_current_style_names(&mut doc);
             Ok(doc)
         }
         "dxf" => {
@@ -108,6 +109,7 @@ pub fn load_file(path: &Path) -> Result<CadDocument, String> {
                 .map_err(|e| e.to_string())?;
             fix_dxf_dimension_rotations(&mut doc);
             fix_viewport_status_flags(&mut doc);
+            fix_current_style_names(&mut doc);
             Ok(doc)
         }
         _ => Err(format!("Unsupported file format: .{ext}")),
@@ -235,6 +237,38 @@ pub fn save(doc: &CadDocument, path: &Path) -> Result<(), String> {
 
 // ── Post-load fixups ──────────────────────────────────────────────────────
 
+// Resolve the current text / dimension / multiline style from the handle the
+// DWG header stores into the *name* the app reads. DXF stores these as names
+// directly ($TEXTSTYLE / $DIMSTYLE / $CMLSTYLE), but DWG only stores handles,
+// so without this the current-style markers (and any code keyed on the name)
+// fall back to "Standard". Only overrides when the handle resolves, leaving the
+// DXF-provided names intact.
+fn fix_current_style_names(doc: &mut CadDocument) {
+    use acadrust::objects::ObjectType;
+
+    let h = doc.header.current_text_style_handle;
+    if h.is_valid() {
+        if let Some(name) = doc.text_styles.iter().find(|s| s.handle == h).map(|s| s.name.clone()) {
+            doc.header.current_text_style_name = name;
+        }
+    }
+    let h = doc.header.current_dimstyle_handle;
+    if h.is_valid() {
+        if let Some(name) = doc.dim_styles.iter().find(|s| s.handle == h).map(|s| s.name.clone()) {
+            doc.header.current_dimstyle_name = name;
+        }
+    }
+    let h = doc.header.current_multiline_style_handle;
+    if h.is_valid() {
+        if let Some(name) = doc.objects.values().find_map(|o| match o {
+            ObjectType::MLineStyle(s) if s.handle == h => Some(s.name.clone()),
+            _ => None,
+        }) {
+            doc.header.multiline_style = name;
+        }
+    }
+}
+
 // ── Corrupt-entity guard ──────────────────────────────────────────────────
 //
 // acadrust's DWG parser occasionally desynchronises on certain files and

src/ui/style_list.rs

@@ -9,7 +9,7 @@
 //! carries both `on_press` (select) and `on_double_click` (rename) itself.
 
 use crate::app::{Message, StyleKind};
-use iced::widget::{container, mouse_area, text, text_input};
+use iced::widget::{container, mouse_area, row, text, text_input};
 use iced::{Background, Color, Element, Fill, Theme};
 
 /// Shared id for the inline rename field, so the rename-start handler can focus
@@ -30,13 +30,19 @@ const ACTIVE: Color = Color {
     b: 0.70,
     a: 1.0,
 };
+const CURRENT_CHECK: Color = Color {
+    r: 0.30,
+    g: 0.82,
+    b: 0.36,
+    a: 1.0,
+};
 
 /// One row of the style list. Renders an editable `text_input` when `name` is
 /// the style being renamed (`rename_active`), otherwise a selectable row whose
-/// double click starts the rename.
+/// double click starts the rename. The current style gets a green ✓.
 pub fn item<'a>(
     name: &str,
-    label: String,
+    is_current: bool,
     is_selected: bool,
     kind: StyleKind,
     on_select: Message,
@@ -53,7 +59,16 @@ pub fn item<'a>(
             .width(Fill)
             .into()
     } else {
-        let row = container(text(label).size(11).color(TEXT))
+        // Fixed-width ✓ column keeps every name left-aligned whether or not the
+        // row is current.
+        let check = if is_current {
+            text("✓").size(11).color(CURRENT_CHECK)
+        } else {
+            text("").size(11)
+        };
+        let label = row![check.width(14), text(name.to_string()).size(11).color(TEXT)]
+            .align_y(iced::Center);
+        let cell = container(label)
             .padding([4, 8])
             .width(Fill)
             .style(move |_: &Theme| container::Style {
@@ -61,7 +76,7 @@ pub fn item<'a>(
                 text_color: Some(TEXT),
                 ..Default::default()
             });
-        mouse_area(row)
+        mouse_area(cell)
             .on_press(on_select)
             .on_double_click(Message::StyleRenameStart(kind, name.to_string()))
             .into()

src/ui/style_manager.rs

@@ -114,16 +114,10 @@ pub fn view<'a, 'b>(s: Scaffold<'a, 'b>) -> Element<'a, Message> {
         .iter()
         .map(|name| {
             let is_sel = name.as_str() == s.selected;
-            // Mark the current style with a leading ✓; pad the rest so names
-            // line up.
-            let label = if s.current == Some(name.as_str()) {
-                format!("✓ {name}")
-            } else {
-                format!("    {name}")
-            };
+            let is_current = s.current == Some(name.as_str());
             crate::ui::style_list::item(
                 name,
-                label,
+                is_current,
                 is_sel,
                 s.kind,
                 (s.on_select)(name.clone()),