feat(style): pick colours from ACI swatches in the style editors (#94)

Dimension, multileader and table style editors took colours as raw ACI
integers in a text box. Replace those with a swatch row (the 9 standard
ACI colours + ByLayer) that highlights the current value, reusing each
editor's existing colour edit message (the chosen index is sent as the
field's string value, so no new plumbing).

Text styles carry no colour field, so none was needed there.

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

src/ui/tablestyle.rs

@@ -121,6 +121,53 @@ pub fn view_window<'a>(
             .align_y(iced::Center)
             .into()
         };
+        // ACI swatch row — sends the chosen index through the same cell edit.
+        let cell_color = |label: &'static str, value: &'a str, field: &'static str| -> Element<'a, Message> {
+            let cur: i16 = value.trim().parse().unwrap_or(256);
+            let mut sw = row![].spacing(2).align_y(iced::Center);
+            for aci in 1u8..=9 {
+                let c = acadrust::types::Color::from_index(aci as i16);
+                let (bg, _) = crate::ui::properties::acad_color_display(c);
+                let sel = cur == aci as i16;
+                sw = sw.push(
+                    button(text("").width(16).height(14))
+                        .on_press(Message::TableStyleCellEdit {
+                            row,
+                            field,
+                            value: aci.to_string(),
+                        })
+                        .style(move |_: &Theme, _| button::Style {
+                            background: Some(Background::Color(bg)),
+                            border: Border {
+                                color: if sel { Color::WHITE } else { Color::BLACK },
+                                width: if sel { 2.0 } else { 1.0 },
+                                radius: 2.0.into(),
+                            },
+                            ..Default::default()
+                        }),
+                );
+            }
+            sw = sw.push(
+                button(text("ByLayer").size(10))
+                    .on_press(Message::TableStyleCellEdit {
+                        row,
+                        field,
+                        value: "256".to_string(),
+                    })
+                    .style(move |_: &Theme, _| button::Style {
+                        border: Border {
+                            color: if cur == 256 { Color::WHITE } else { BORDER },
+                            width: if cur == 256 { 2.0 } else { 1.0 },
+                            radius: 2.0.into(),
+                        },
+                        ..Default::default()
+                    }),
+            );
+            row![text(label).size(11).color(DIM).width(150), sw]
+                .spacing(8)
+                .align_y(iced::Center)
+                .into()
+        };
         let mut col = Column::new()
             .spacing(3)
             .push(text(row_label).size(11).color(ACCENT))
@@ -131,18 +178,8 @@ pub fn view_window<'a>(
                 "textstyle",
             ))
             .push(cell_in("  Text height:", "0.18", &cell_height[r], "height"))
-            .push(cell_in(
-                "  Text color (ACI):",
-                "256",
-                &cell_textcolor[r],
-                "textcolor",
-            ))
-            .push(cell_in(
-                "  Fill color (ACI):",
-                "256",
-                &cell_fillcolor[r],
-                "fillcolor",
-            ))
+            .push(cell_color("  Text color:", &cell_textcolor[r], "textcolor"))
+            .push(cell_color("  Fill color:", &cell_fillcolor[r], "fillcolor"))
             .push(
                 row![
                     text("  Alignment:").size(11).color(DIM).width(150),