fix(microscopy): rename measurement in microscopy mode (#5866)

tests/pages/MainToolbarPageObject.ts

@@ -194,7 +194,6 @@ export class MainToolbarPageObject {
           },
         };
       },
-
       get freehandROI() {
         const button = page.getByTestId('PlanarFreehandROI');
         return {
@@ -205,6 +204,21 @@ export class MainToolbarPageObject {
           },
         };
       },
+      /* microscopy specific tools */
+      // `.last()` targets the menu item inside the dropdown, not the active-tool
+      // indicator inside the split-button primary
+      // because both share the same data-cy value (e.g. "line")
+      // Other microscopy tools might follow the same pattern
+      get line() {
+        const button = page.getByTestId('line').last();
+        return {
+          button,
+          async click() {
+            await measurementTools.click();
+            await button.click();
+          },
+        };
+      },
     };
   }