assistant2: Add icon for copy-path tool (#27421)

Release Notes:

- N/A

crates/assistant2/src/active_thread.rs

@@ -1253,6 +1253,7 @@ impl ActiveThread {
 
         let tool_icon = match tool_use.name.as_ref() {
             "bash" => IconName::Terminal,
+            "copy-path" => IconName::Clipboard,
             "delete-path" => IconName::Trash,
             "diagnostics" => IconName::Warning,
             "edit-files" => IconName::Pencil,

crates/ui/src/components/icon.rs

@@ -169,6 +169,7 @@ pub enum IconName {
     ChevronUp,
     ChevronUpDown,
     Circle,
+    Clipboard,
     Close,
     Code,
     Cog,