fix(xref): Change Path Type flyout with hover reveal

The Change Path Type row shows a right-triangle affordance and reveals the Make Absolute / Make Relative / Remove Path submenu beside it. The flyout opens on hover only and a shared submenu-row style removes dead code from the earlier iterations.

src/app/update/dialog.rs

@@ -1191,8 +1191,8 @@ pub(super) fn on_ribbon_tool_click(&mut self, tool_id: String, event: ModuleEven
                     }
                 }
             }
-            XrefPaletteOp::Open | XrefPaletteOp::Attach => {
-                // Handled in update/mod.rs XrefRowOp dispatch (navigation / picker), not here.
+            XrefPaletteOp::Open => {
+                // Handled in update/mod.rs XrefRowOp dispatch (navigation), not here.
             }
         }
         if done > 0 {

src/app/update/mod.rs

@@ -2333,9 +2333,18 @@ impl OpenCADStudio {
                 }
                 // Row-scoped op: select the row first, then run the op.
                 self.xref_manager.right_click_select(index);
+                self.xref_manager.row_change_path_open = false;
                 self.xref_manager_op(op);
                 Task::none()
             }
+            Message::XrefRowChangePathEnter => {
+                self.xref_manager.row_change_path_open = true;
+                Task::none()
+            }
+            Message::XrefRowChangePathLeave => {
+                self.xref_manager.row_change_path_open = false;
+                Task::none()
+            }
             Message::XrefFindReplacePrompt => {
                 // No fields in the panel: prefill the command line so the
                 // existing `XREF Path Find <old> <new>` parsing runs it.