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 <noreply@anthropic.com>

src/ui/mleaderstyle.rs

@@ -126,6 +126,53 @@ fn num_row<'a>(
     .into()
 }
 
+/// ACI colour swatch row (1-9 + ByLayer). Reuses MLeaderStyleEdit by sending
+/// the chosen index as the field's string value.
+fn color_row<'a>(label: &'static str, value: &'a str, field: &'static str) -> Element<'a, Message> {
+    let cur: i16 = value.trim().parse().unwrap_or(256);
+    let mut swatches = 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;
+        swatches = swatches.push(
+            button(text("").width(16).height(14))
+                .on_press(Message::MLeaderStyleEdit {
+                    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()
+                }),
+        );
+    }
+    swatches = swatches.push(
+        button(text("ByLayer").size(10))
+            .on_press(Message::MLeaderStyleEdit {
+                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), swatches]
+        .spacing(8)
+        .align_y(iced::Center)
+        .into()
+}
+
 fn enum_row<'a>(
     label: &'static str,
     options: Vec<String>,
@@ -213,7 +260,7 @@ pub fn view_window<'a>(v: MLeaderStyleView<'a>) -> Element<'a, Message> {
                     format!("{:?}", s.path_type),
                     "path_type"
                 ),
-                num_row("Line color (ACI):", "256", v.line_color, "line_color"),
+                color_row("Line color (ACI):", v.line_color, "line_color"),
                 num_row("Line weight:", "-2", v.line_weight, "line_weight"),
                 handle_row(
                     "Line type:",
@@ -289,7 +336,7 @@ pub fn view_window<'a>(v: MLeaderStyleView<'a>) -> Element<'a, Message> {
                     "text_style_handle"
                 ),
                 num_row("Text height:", "0.18", v.text_height, "text_height"),
-                num_row("Text color (ACI):", "256", v.text_color, "text_color"),
+                color_row("Text color (ACI):", v.text_color, "text_color"),
                 enum_row(
                     "Text angle:",
                     opts(&["ParallelToLastLeaderLine", "Horizontal", "Optimized"]),
@@ -342,7 +389,7 @@ pub fn view_window<'a>(v: MLeaderStyleView<'a>) -> Element<'a, Message> {
                     v.block_content_name.clone(),
                     "block_content_handle"
                 ),
-                num_row("Block color (ACI):", "256", v.block_color, "block_color"),
+                color_row("Block color (ACI):", v.block_color, "block_color"),
                 enum_row(
                     "Block connection:",
                     opts(&["BlockExtents", "BasePoint"]),