Insert Reference panel: separate Attach XREF and Attach PDF buttons

The single Attach button gives way to Attach XREF (XATTACH, the external
reference picker and dialog) and Attach PDF (PDFATTACH, the PDF picker and
Attach PDF Underlay dialog) with their own icons. ATTACH stays available
as a command. The Turkish label reads "PDF Bağla".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/modules/insert/mod.rs

@@ -52,6 +52,7 @@ impl CadModule for InsertModule {
                     title: "Reference",
                     tools: vec![
                         RibbonItem::LargeTool(xattach::tool()),
+                        RibbonItem::LargeTool(pdf_attach::tool()),
                         RibbonItem::LargeTool(xclip::tool()),
                         RibbonItem::LargeTool(xadjust::tool()),
                         RibbonItem::LabeledTool(underlay_layers::tool()),

src/modules/insert/pdf_attach.rs

@@ -21,6 +21,19 @@ use glam::DVec3;
 
 use crate::command::{CadCommand, CmdOption, CmdResult, InputKind, WorkingPlane};
 use crate::scene::model::wire_model::WireModel;
+use crate::modules::{IconKind, ModuleEvent, ToolDef};
+
+pub const ICON: IconKind =
+    IconKind::Svg(include_bytes!("../../../assets/icons/underlay_layers.svg"));
+
+pub fn tool() -> ToolDef {
+    ToolDef {
+        id: "PDFATTACH",
+        label: "Attach PDF",
+        icon: ICON,
+        event: ModuleEvent::Command("PDFATTACH".to_string()),
+    }
+}
 
 /// Units the Unit option offers: keyword, the name the prompt shows.
 const UNITS: [(&str, &str); 9] = [

src/modules/insert/xattach.rs

@@ -26,10 +26,10 @@ use crate::scene::Scene;
 
 pub fn tool() -> ToolDef {
     ToolDef {
-        id: "ATTACH",
-        label: "Attach",
+        id: "XATTACH",
+        label: "Attach XREF",
         icon: IconKind::Svg(include_bytes!("../../../assets/icons/blocks/insert.svg")),
-        event: ModuleEvent::Command("ATTACH".to_string()),
+        event: ModuleEvent::Command("XATTACH".to_string()),
     }
 }