fix(styles): make double-click inline rename actually fire

The list row wrapped a `button` inside the `mouse_area`. The button
captured the press, so the parent `mouse_area` never saw the second
click and `on_double_click` never fired — double-clicking a style name
did nothing.

Drop the inner button: the row is now a plain `mouse_area` carrying both
`on_press` (select) and `on_double_click` (start rename), with selection
shown via the container background. Focus the rename field on start so
the user can type immediately.

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

src/app/update.rs

@@ -6170,7 +6170,9 @@ impl OpenCADStudio {
             // ── Shared inline rename (all style managers) ─────────────────
             Message::StyleRenameStart(kind, name) => {
                 self.style_rename_start(kind, name);
-                Task::none()
+                // 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())
             }
             Message::StyleRenameEdit(s) => {
                 self.style_rename_buf = s;

src/ui/style_list.rs

@@ -1,28 +1,51 @@
 //! Shared style-manager list row.
 //!
 //! Every style manager renders the same left-hand list of style names where a
-//! single click selects and a double click renames inline. Only the row's
+//! single click selects and a double click renames inline.
-//! button style differs per manager, so it is passed in.
+//!
+//! The whole row is a `mouse_area` (not a `button`): an inner interactive
+//! widget would capture the press and the parent `mouse_area` would never see
+//! the second click, so `on_double_click` would never fire. `mouse_area`
+//! carries both `on_press` (select) and `on_double_click` (rename) itself.
 
 use crate::app::{Message, StyleKind};
-use iced::widget::button::{Status, Style};
+use iced::widget::{container, mouse_area, text, text_input};
-use iced::widget::{button, mouse_area, text, text_input};
+use iced::{Background, Color, Element, Fill, Theme};
-use iced::{Element, Fill, Theme};
+
+/// Shared id for the inline rename field, so the rename-start handler can focus
+/// it the moment the row turns editable.
+pub fn rename_input_id() -> iced::widget::Id {
+    iced::widget::Id::new("style-rename-input")
+}
+
+const TEXT: Color = Color {
+    r: 0.88,
+    g: 0.88,
+    b: 0.88,
+    a: 1.0,
+};
+const ACTIVE: Color = Color {
+    r: 0.20,
+    g: 0.40,
+    b: 0.70,
+    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 button
+/// the style being renamed (`rename_active`), otherwise a selectable row whose
-/// wrapped in a `mouse_area` whose double click starts the rename.
+/// double click starts the rename.
 pub fn item<'a>(
     name: &str,
     label: String,
+    is_selected: bool,
     kind: StyleKind,
     on_select: Message,
     rename_active: Option<&str>,
     rename_buf: &'a str,
-    style: impl Fn(&Theme, Status) -> Style + 'a,
 ) -> Element<'a, Message> {
     if rename_active == Some(name) {
         text_input("", rename_buf)
+            .id(iced::widget::Id::new("style-rename-input"))
             .on_input(Message::StyleRenameEdit)
             .on_submit(Message::StyleRenameCommit(kind))
             .size(11)
@@ -30,14 +53,17 @@ pub fn item<'a>(
             .width(Fill)
             .into()
     } else {
-        mouse_area(
+        let row = container(text(label).size(11).color(TEXT))
-            button(text(label).size(11))
+            .padding([4, 8])
-                .on_press(on_select)
+            .width(Fill)
-                .style(style)
+            .style(move |_: &Theme| container::Style {
-                .padding([4, 8])
+                background: is_selected.then_some(Background::Color(ACTIVE)),
-                .width(Fill),
+                text_color: Some(TEXT),
-        )
+                ..Default::default()
-        .on_double_click(Message::StyleRenameStart(kind, name.to_string()))
+            });
-        .into()
+        mouse_area(row)
+            .on_press(on_select)
+            .on_double_click(Message::StyleRenameStart(kind, name.to_string()))
+            .into()
     }
 }

src/ui/style_manager.rs

@@ -48,12 +48,6 @@ const ACCENT: Color = Color {
     b: 0.85,
     a: 1.0,
 };
-const ACTIVE: Color = Color {
-    r: 0.20,
-    g: 0.40,
-    b: 0.70,
-    a: 1.0,
-};
 const LIST: Color = Color {
     r: 0.12,
     g: 0.12,
@@ -128,11 +122,11 @@ pub fn view<'a, 'b>(s: Scaffold<'a, 'b>) -> Element<'a, Message> {
             crate::ui::style_list::item(
                 name,
                 label,
+                is_sel,
                 s.kind,
                 (s.on_select)(name.clone()),
                 s.rename_active,
                 s.rename_buf,
-                list_item(is_sel),
             )
         })
         .collect();
@@ -222,23 +216,6 @@ fn btn_s(accent: bool) -> impl Fn(&Theme, Status) -> Style {
     }
 }
 
-fn list_item(active: bool) -> impl Fn(&Theme, Status) -> Style {
-    move |_: &Theme, st| Style {
-        background: Some(Background::Color(match (active, st) {
-            (true, _) => ACTIVE,
-            (false, Status::Hovered | Status::Pressed) => Color {
-                r: 0.26,
-                g: 0.26,
-                b: 0.26,
-                a: 1.0,
-            },
-            _ => Color::TRANSPARENT,
-        })),
-        text_color: TEXT,
-        ..Default::default()
-    }
-}
-
 fn hdivider<'a>() -> Element<'a, Message> {
     container(Space::new().width(Fill).height(1))
         .width(Fill)